check_applicability

Says whether a project must meet the prevailing wage and apprenticeship requirements to claim the increased (5x) credit, and which ones: the credit involved, when construction began (before January 29, 2023 is exempt for 30C, 45, 45Q, 45V, 45Y, 48, 48E and 179D; 45L, 45U, 45Z and 48C have no such exception), the one-megawatt exception for 45, 45Y, 48 and 48E (maximum net output under 1 MW AC by nameplate, aggregated across the energy project or across facilities with integrated operations; for DC generation the lesser of the DC nameplate sum or the first inverter), construction versus alteration or repair after placed in service (apprenticeship applies to construction only; prevailing wages continue 5 years for the ITC, 10 for the PTC), the applicable apprentice percentage (10 / 12.5 / 15%), whether the project is under section 48 or 48E, and for solar and wind the 2025 law’s termination dates (construction after July 4, 2026 must be placed in service by December 31, 2027).

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Argument	Type	Description
credit*	string	The Code section claimed: 48 (energy credit), 48E (clean electricity investment credit), 45, 45Y, 45Q, 45V, 45Z, 45U, 45L, 179D, 30C or 48C.
work_type	string	construction (default) or alteration_or_repair after the facility is placed in service.
technology	string	What the facility is: solar or wind (the 2025 law’s termination dates apply), storage, or other.
dwelling_type	string	For 45L only: the kind of home (prevailing wage reaches only multifamily units).
placed_in_service	string	Placed-in-service date (YYYY-MM-DD), if known or planned.
construction_began*	string	When construction began (YYYY-MM-DD), under the IRS beginning-of-construction rules (physical work test or 5% safe harbor).
max_net_output_mw_ac	number	Maximum net output in megawatts AC by nameplate, AGGREGATED: for section 48 the sum of every energy property in the energy project (1.48-13(e)(1)); for 48E and 45Y the sum of every same-technology facility or storage with integrated operations (same or related owner, same taxable year placed in service, same point of interconnection or end user: 1.48E-3(c)(4), 1.45Y-3(c)(3)). Leave out if not an electricity or thermal project.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "credit",
    "construction_began"
  ],
  "properties": {
    "credit": {
      "enum": [
        "45",
        "48",
        "48E",
        "45Y",
        "45Q",
        "45V",
        "45Z",
        "45U",
        "45L",
        "179D",
        "30C",
        "48C"
      ],
      "type": "string",
      "description": "The Code section claimed: 48 (energy credit), 48E (clean electricity investment credit), 45, 45Y, 45Q, 45V, 45Z, 45U, 45L, 179D, 30C or 48C."
    },
    "work_type": {
      "enum": [
        "construction",
        "alteration_or_repair"
      ],
      "type": "string",
      "description": "construction (default) or alteration_or_repair after the facility is placed in service."
    },
    "technology": {
      "enum": [
        "solar",
        "wind",
        "storage",
        "other"
      ],
      "type": "string",
      "description": "What the facility is: solar or wind (the 2025 law’s termination dates apply), storage, or other."
    },
    "dwelling_type": {
      "enum": [
        "single_family",
        "manufactured",
        "multifamily"
      ],
      "type": "string",
      "description": "For 45L only: the kind of home (prevailing wage reaches only multifamily units)."
    },
    "placed_in_service": {
      "type": "string",
      "maxLength": 10,
      "description": "Placed-in-service date (YYYY-MM-DD), if known or planned."
    },
    "construction_began": {
      "type": "string",
      "maxLength": 10,
      "description": "When construction began (YYYY-MM-DD), under the IRS beginning-of-construction rules (physical work test or 5% safe harbor)."
    },
    "max_net_output_mw_ac": {
      "type": "number",
      "minimum": 0,
      "description": "Maximum net output in megawatts AC by nameplate, AGGREGATED: for section 48 the sum of every energy property in the energy project (1.48-13(e)(1)); for 48E and 45Y the sum of every same-technology facility or storage with integrated operations (same or related owner, same taxable year placed in service, same point of interconnection or end user: 1.48E-3(c)(4), 1.45Y-3(c)(3)). Leave out if not an electricity or thermal project."
    }
  },
  "additionalProperties": false
}

check_apprentice_hours

The apprenticeship labor-hours requirement for one facility (26 CFR 1.45-8(b)): qualified apprentices must perform the applicable percentage (10% if construction began before 2023, 12.5% in 2023, 15% from 2024) of total labor hours, counting every contractor and subcontractor, after excluding hours of foremen, superintendents, owners and executive/administrative/professional staff, and counting apprentice hours only within the daily ratio. Returns the required hours, the shortfall, and the cure the IRS accepts: $50 per shortfall hour ($500 with intentional disregard), including participation failures (an employer with 4+ individuals and no apprentice: its labor hours divided by its number of laborers and mechanics).

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Argument	Type	Description
good_faith_hours	number	Apprentice hours covered by denied or unanswered good-faith requests (1.45-8(f)(1)); they count as apprentice hours.
total_labor_hours*	number	Total labor hours of construction, alteration or repair on the facility by all laborers and mechanics (every employer), apprentices included; hours of foremen, superintendents, owners and 541-exempt staff already left out.
construction_began*	string	When construction began (YYYY-MM-DD or a year): sets the percentage.
intentional_disregard	boolean	true if the failure was knowing or willful (the IRS decides); the rate becomes $500 an hour.

check_daily_ratio

The ratio requirement (26 CFR 1.45-8(c)): on each day, for one employer and one occupation on the job site, the number of apprentices may not exceed what the registered program’s apprentice-to-journeyworker ratio allows for the journeyworkers present (or the ratio for the facility’s area). Give the program ratio and, for each day, the headcounts of journeyworkers and apprentices on site (the controlling input) with each apprentice’s hours; the tool returns the apprentice hours that count toward the percentage and the excess hours that do not (they stay in total labor hours and must be paid the full journeyworker prevailing rate: 1.45-7(b)(7)(iii), 29 CFR 5.5(a)(4)(i)). With hours only and no headcounts it prorates on hours, marked as an interpretation.

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Argument	Type	Description
days*	array	One entry per day for one employer and occupation.
ratio_apprentices	integer	Apprentices side of the program ratio (default 1).
ratio_journeyworkers	integer	Journeyworkers side of the program ratio (default 1). A 1:1 program = 1 and 1; 2 apprentices per journeyworker = 2 and 1.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "days"
  ],
  "properties": {
    "days": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "journeyworker_hours"
        ],
        "properties": {
          "date": {
            "type": "string",
            "maxLength": 10,
            "description": "YYYY-MM-DD (optional label)."
          },
          "apprentices": {
            "type": "integer",
            "minimum": 0,
            "description": "Headcount of apprentices on site that day."
          },
          "journeyworkers": {
            "type": "integer",
            "minimum": 0,
            "description": "Headcount of journeyworkers on site that day: the regulation’s test (1.45-8(c)(2))."
          },
          "apprentice_hours": {
            "type": "number",
            "minimum": 0,
            "description": "Hours worked that day by registered apprentices in the occupation."
          },
          "journeyworker_hours": {
            "type": "number",
            "minimum": 0,
            "description": "Hours worked that day by journeyworkers in the occupation (a working foreperson or owner who is a qualified journeyworker counts here)."
          },
          "apprentice_hours_by_person": {
            "type": "array",
            "items": {
              "type": "number",
              "minimum": 0
            },
            "maxItems": 100,
            "description": "Each apprentice’s hours that day (one number per apprentice); replaces apprentice_hours and apprentices when given, and lets the excess be measured per person."
          }
        },
        "additionalProperties": false
      },
      "maxItems": 366,
      "minItems": 1,
      "description": "One entry per day for one employer and occupation."
    },
    "ratio_apprentices": {
      "type": "integer",
      "maximum": 20,
      "minimum": 1,
      "description": "Apprentices side of the program ratio (default 1)."
    },
    "ratio_journeyworkers": {
      "type": "integer",
      "maximum": 20,
      "minimum": 1,
      "description": "Journeyworkers side of the program ratio (default 1). A 1:1 program = 1 and 1; 2 apprentices per journeyworker = 2 and 1."
    }
  },
  "additionalProperties": false
}

check_good_faith_request

Judges a request for apprentices under the Good Faith Effort Exception (26 CFR 1.45-8(f)(1)): a written request (electronic or registered mail) to a registered apprenticeship program covering the facility’s area and occupation, sent at least 45 days before the apprentices are needed (14 days for a later request to the same program), with the dates, occupation, location, number, expected hours, contact and a statement of intent to employ. Denied, or unanswered for 5 business days, it stands in for the apprentices for its period, up to 365 days (366 across a leap year). Returns the lead-time check, the response status, how long the exception runs and when to request again.

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Argument	Type	Description
today	string	The date to judge from (YYYY-MM-DD); defaults to the response date or the request date.
response	string	The program’s answer so far (default none).
request_date*	string	When the request was sent (YYYY-MM-DD): the send date for email, the delivery date on the receipt for registered mail.
received_date	string	When the program received it (YYYY-MM-DD), if different: the five business days run from receipt (1.45-8(f)(1)(i)(C)).
response_date	string	When the program answered (YYYY-MM-DD), if it did.
needed_from_date

check_prevailing_wage

Compares pay for one classification with the Davis-Bacon prevailing rate (basic hourly rate + fringe from the wage determination; look it up with lookup_wage_determination) and, if short, computes the IRS cure: the shortfall (x3 for intentional disregard), interest at the Federal short-term rate + 6 points, and the $5,000 per-worker penalty ($10,000 for intentional disregard), with the penalty waivers (corrected by the quarter deadline and either no more than 10% of pay periods short or no more than 5% short; or work under a qualifying project labor agreement). Cash plus bona fide fringe contributions together must reach base plus fringe (29 CFR 5.31).

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Argument	Type	Description
hours	number	Hours worked at this (short) pay: only the underpaid hours, to total the shortfall.
workers	integer	How many laborers or mechanics were paid this way (the penalty is per worker).
cash_rate_paid*	number	Cash wages paid ($/hour).
classification	string	The work classification (e.g. Electrician), for the record.
wages_due_date	string	When the wages were due (YYYY-MM-DD): the server looks up that quarter’s Federal short-term rate (table through 2026-10-16) to show the interest rate.
year_wages_paid	number

count_participation

The participation requirement (26 CFR 1.45-8(d)): a taxpayer, contractor or subcontractor that employs four or more individuals to perform construction, alteration or repair work on the facility, counted over the whole construction (not at one time), must employ at least one qualified apprentice there. Give the people one employer used on this facility with their roles; the tool says who counts toward the four (laborers, mechanics and apprentices do; a supervising foreperson, an exempt 20%+ managing owner and office staff do not; a working foreperson or superintendent over 20% manual duties who is not 541-exempt, or a nonexempt owner doing trade work, does under this server’s reading), whether an apprentice is required, and whose hours are out of the labor-hours denominator either way.

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Argument	Type	Description
people*	array	Everyone this employer used on the facility over the whole construction, one entry each.
employer	string	The company (taxpayer, contractor or subcontractor) these people work for.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "people"
  ],
  "properties": {
    "people": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "role"
        ],
        "properties": {
          "name": {
            "type": "string",
            "maxLength": 80,
            "description": "A name or label (optional)."
          },
          "role": {
            "enum": [
              "laborer_or_mechanic",
              "apprentice",
              "working_foreperson",
              "foreperson_supervising_only",
              "superintendent",
              "owner",
              "project_manager",
              "office_or_professional"
            ],
            "type": "string",
            "description": "What the person does on this facility."
          },
          "exempt_541": {
            "type": "boolean",
            "description": "For a working foreperson or superintendent: meets the 29 CFR part 541 executive, administrative or professional exemption (salaried, primary duty management). If true the 20% test does not apply and they are not a laborer or mechanic."
          },
          "manual_share": {
            "type": "number",
            "maximum": 1,
            "minimum": 0,
            "description": "For a working foreperson or superintendent: the share of the workweek spent on laborer or mechanic duties (0.3 = 30%). More than 0.2, for someone not exempt under 29 CFR part 541, makes them a laborer or mechanic for that time (1.45-7(d)(8)(i))."
          },
          "owner_manages": {
            "type": "boolean",
            "description": "For an owner: actively manages the business (29 CFR 541.101)."
          },
          "does_trade_work": {
            "type": "boolean",
            "description": "For an owner: performs covered laborer or mechanic work on the facility."
          },
          "owner_equity_pct": {
            "type": "number",
            "maximum": 100,
            "minimum": 0,
            "description": "For an owner: percent equity in the business."
          }
        },
        "additionalProperties": false
      },
      "maxItems": 200,
      "minItems": 1,
      "description": "Everyone this employer used on the facility over the whole construction, one entry each."
    },
    "employer": {
      "type": "string",
      "maxLength": 120,
      "description": "The company (taxpayer, contractor or subcontractor) these people work for."
    }
  },
  "additionalProperties": false
}

fetch

Returns the full text of a document found with search: overview:<topic>, records:<requirement>, form7220, law2025, tennessee, or reg:<section>[(paragraph)] such as reg:1.45-8(d), which is read live from the eCFR.

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Argument	Type	Description
id*	string	A document id from search.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "id"
  ],
  "properties": {
    "id": {
      "type": "string",
      "maxLength": 80,
      "minLength": 1,
      "description": "A document id from search."
    }
  },
  "additionalProperties": false
}

find_apprenticeship_programs

Registered apprenticeship programs a contractor can send a good-faith request to (26 CFR 1.45-8(f)(1)): a program whose area covers the facility and that trains the occupation. For Tennessee it reads the State Apprenticeship Agency’s live list of registered programs (program, occupation, participating employers, county) and filters by occupation and county; for other states it gives the apprenticeship.gov partner finder and the State office to contact. Occupation is matched as text, so "electric" finds Electrician programs.

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Argument	Type	Description
state*	string	Two-letter state, e.g. TN.
counties	array	County names to keep (e.g. ["Warren", "Van Buren"]); leave out for the whole state.
occupation	string	The trade, e.g. electrician, laborer, operating engineer, solar.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "state"
  ],
  "properties": {
    "state": {
      "type": "string",
      "maxLength": 2,
      "minLength": 2,
      "description": "Two-letter state, e.g. TN."
    },
    "counties": {
      "type": "array",
      "items": {
        "type": "string",
        "maxLength": 40
      },
      "maxItems": 10,
      "description": "County names to keep (e.g. [\"Warren\", \"Van Buren\"]); leave out for the whole state."
    },
    "occupation": {
      "type": "string",
      "maxLength": 60,
      "description": "The trade, e.g. electrician, laborer, operating engineer, solar."
    }
  },
  "additionalProperties": false
}

lookup_wage_determination

Fetches a Davis-Bacon general wage determination live from SAM.gov: by number (e.g. TN20260124, newest modification unless a revision is given) or by state, county and construction type (Building, Residential, Heavy, Highway; utility-scale solar and wind farms are Heavy). Returns the determination’s counties, modifications and every classification’s basic rate and fringe, optionally filtered to one classification, with the SAM.gov page to cite. Use the determination in force when the contract was executed (26 CFR 1.45-7(b)). A classification that is missing needs DOL’s additional classification and rate ([email protected]).

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Argument	Type	Description
state	string	Two-letter state (for a search).
county	string	County name (for a search), e.g. Van Buren.
number	string	A determination number like TN20260124.
revision	integer	A specific modification number (default: the newest on SAM.gov).
classification	string	Show only classifications matching this (e.g. electrician, laborer, crane).
construction_type	string	Building, Residential, Heavy or Highway (for a search).

Input schema (JSON)

official_sources

The primary sources behind every answer here (IRS pages and FAQs, Form 7220, the Code, the regulations on eCFR, the Treasury decision with its preamble, DOL’s IRA page, SAM.gov wage determinations, apprenticeship.gov and the Tennessee apprenticeship agency), with one line on what each is for.

read-only

No arguments.

Input schema (JSON)

{
  "type": "object",
  "properties": {},
  "additionalProperties": false
}

pwa_overview

Start here. Explains the IRS prevailing wage and apprenticeship (PWA) requirements for the increased clean-energy credit (ITC under IRC 48 / 48E and the other IRA credits): what they are, when they apply (the 1 MW and January 29, 2023 exceptions), the prevailing wage rule, the three apprenticeship tests (labor-hours percentage, daily ratio, four-or-more participation), the good-faith exception, cures and penalties, records and Form 7220, with the regulation paragraph for every figure. Ask for one topic or all of them.

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Argument	Type	Description
topic	string	all (default), what, prevailing_wage, apprenticeship, penalties, records, changes_2025 or sources.

Input schema (JSON)

{
  "type": "object",
  "properties": {
    "topic": {
      "enum": [
        "all",
        "what",
        "prevailing_wage",
        "apprenticeship",
        "penalties",
        "records",
        "changes_2025",
        "sources"
      ],
      "type": "string",
      "description": "all (default), what, prevailing_wage, apprenticeship, penalties, records, changes_2025 or sources."
    }
  },
  "additionalProperties": false
}

read_regulation

Returns the current text of a paragraph of the governing regulations straight from the eCFR, with its citation and URL: 26 CFR 1.45-6, 1.45-7, 1.45-8, 1.45-12, 1.48-13, 1.48E-3 and the Labor rules they rest on (29 CFR 541.101 owner exemption, 5.5 apprentices on Davis-Bacon work, 5.31 fringe, 29.5 program standards). Give a paragraph like "(d)" or "(g)(7)" to read one part; leave it out for the whole section. Sections: 1.45-6 (the 5x increased amount and when PWA applies to it); 1.45-7 (who is paid, which wage determination, corrections and penalties, definitions); 1.45-8 (labor hours (b), ratio (c), participation (d), examples (e), good faith and cure (f), definitions (g)); 1.45-12 (the records a taxpayer must keep for prevailing wage and apprenticeship); 1.48-13 (how 1.45-7/-8 apply to the energy credit, the 1 MW exception, alteration and repair); 1.48E-3 (how 1.45-7/-8 apply to section 48E facilities and energy storage); 541.101 (the 20% equity, actively-managing owner who is a bona fide exempt executive); 5.5 (apprentices: ratio, rates, registration (paragraph (a)(4))); 5.31 (cash, fringe benefits or a combination); 29.5 (what a registered program must provide: ratios, supervision, wage schedules).

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Argument	Type	Description
section*	string	The section number, e.g. 1.45-8.
paragraph	string	A paragraph such as (d), (g)(7) or (f)(1); shorthand g7 works. Leave out for the whole section.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "section"
  ],
  "properties": {
    "section": {
      "enum": [
        "1.45-6",
        "1.45-7",
        "1.45-8",
        "1.45-12",
        "1.48-13",
        "1.48E-3",
        "541.101",
        "5.5",
        "5.31",
        "29.5"
      ],
      "type": "string",
      "description": "The section number, e.g. 1.45-8."
    },
    "paragraph": {
      "type": "string",
      "maxLength": 20,
      "description": "A paragraph such as (d), (g)(7) or (f)(1); shorthand g7 works. Leave out for the whole section."
    }
  },
  "additionalProperties": false
}

records_checklist

The records the regulations expect for the prevailing wage and apprenticeship requirements (26 CFR 1.45-12), as a checklist for a taxpayer, a prime contractor or a subcontractor, with how they may be kept (each company keeps its own unredacted records, or hands PII-redacted copies to the taxpayer or a vendor; unredacted records go to the IRS on request) and how they feed Form 7220.

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Argument	Type	Description
role	string	Whose checklist (default taxpayer: the credit claimant).
requirement	string	Which records (default both).

Input schema (JSON)

{
  "type": "object",
  "properties": {
    "role": {
      "enum": [
        "taxpayer",
        "contractor",
        "subcontractor"
      ],
      "type": "string",
      "description": "Whose checklist (default taxpayer: the credit claimant)."
    },
    "requirement": {
      "enum": [
        "both",
        "prevailing_wage",
        "apprenticeship"
      ],
      "type": "string",
      "description": "Which records (default both)."
    }
  },
  "additionalProperties": false
}

search

Full-text search over this guide’s documents: the PWA overview sections, the records checklists, Form 7220, the 2025 law changes, the Tennessee agency, and the governing regulation sections (26 CFR 1.45-6, 1.45-7, 1.45-8, 1.45-12, 1.48-13, 1.48E-3; 29 CFR 541.101, 5.5, 5.31, 29.5). Returns ids to pass to fetch. A paragraph reference like "1.45-8(d)" finds that regulation. For calculations use the check_* tools instead.

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Argument	Type	Description
query*	string	A single query string.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "query"
  ],
  "properties": {
    "query": {
      "type": "string",
      "maxLength": 300,
      "minLength": 1,
      "description": "A single query string."
    }
  },
  "additionalProperties": false
}

ITC Prevailing Wage & Apprenticeship Guide

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check_applicability Read-only

ITC Prevailing Wage & Apprenticeship Guide

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check_applicability Read-only

Tools (14)