IRS Form 2553 S corp election: eligibility, deadlines, late relief, where to file, state rules.
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Calculates the Form 2553 deadline for an S corp election to take effect on a given date (the first day of the tax year, or the day a new business began), including the weekend and holiday rule, and whether a filing today is on time, late but within Rev. Proc. 2013-30 relief, or past it.
The date the S election should take effect, YYYY-MM-DD: the first day of the tax year, or for a new business the date it began (usually its formation date).
Pick your client. Values in capitals, like YOUR_TOKEN, are yours to fill in.
Run in a terminal
claude mcp add --transport http s-corp-election https://www.filemyscorp.com/mcp
Calculates the Form 2553 deadline for an S corp election to take effect on a given date (the first day of the tax year, or the day a new business began), including the weekend and holiday rule, and whether a filing today is on time, late but within Rev. Proc. 2013-30 relief, or past it.
| Argument | Type | Description |
|---|---|---|
| effective_date* | string | The date the S election should take effect, YYYY-MM-DD: the first day of the tax year, or for a new business the date it began (usually its formation date). |
{
"type": "object",
"required": [
"effective_date"
],
"properties": {
"effective_date": {
"type": "string",
"description": "The date the S election should take effect, YYYY-MM-DD: the first day of the tax year, or for a new business the date it began (usually its formation date)."
}
}
}Estimates one year's federal tax effect of an S corp election for a business owner: self-employment tax without the election versus payroll tax on a reasonable salary with it, minus the income-tax offset (smaller payroll-tax deduction and lost QBI deduction) and the added cost of running an S corp. Uses 2026 Social Security and Medicare figures.
| Argument | Type | Description |
|---|---|---|
| salary | number | Planned annual W-2 salary for the owner. If left out, 50% of profit is used as a starting point (not an IRS rule). |
| net_profit* | number | Annual net business profit before any owner salary, in dollars. |
| added_costs | number | Extra yearly cost of an S corp (payroll service, the 1120-S return). Defaults to 1500. |
| filing_status | string | Owner's filing status. Defaults to single. |
| marginal_rate | number | Owner's marginal federal income tax rate as a decimal, e.g. 0.22. Defaults to 0.22. |
{
"type": "object",
"required": [
"net_profit"
],
"properties": {
"salary": {
"type": "number",
"description": "Planned annual W-2 salary for the owner. If left out, 50% of profit is used as a starting point (not an IRS rule)."
},
"net_profit": {
"type": "number",
"description": "Annual net business profit before any owner salary, in dollars."
},
"added_costs": {
"type": "number",
"description": "Extra yearly cost of an S corp (payroll service, the 1120-S return). Defaults to 1500."
},
"filing_status": {
"enum": [
"single",
"married"
],
"type": "string",
"description": "Owner's filing status. Defaults to single."
},
"marginal_rate": {
"type": "number",
"description": "Owner's marginal federal income tax rate as a decimal, e.g. 0.22. Defaults to 0.22."
}
}
}Returns the link to FileMyScorp's website for having Form 2553 prepared and sent, or to the tax-professional sign-up page. It only returns a link; it does not start a filing or take payment.
| Argument | Type | Description |
|---|---|---|
| audience | string | business_owner (default) files for their own business; tax_professional files for clients. |
{
"type": "object",
"properties": {
"audience": {
"enum": [
"business_owner",
"tax_professional"
],
"type": "string",
"description": "business_owner (default) files for their own business; tax_professional files for clients."
}
}
}Explains the federal S corporation election on IRS Form 2553: who is eligible, the on-time deadline and Rev. Proc. 2013-30 late-election relief (including the required wording), shareholder consent and wet-ink signatures, and how to file and prove filing (fax, certified mail, CP261).
| Argument | Type | Description |
|---|---|---|
| topic | string | Which part to explain. Defaults to all. |
{
"type": "object",
"properties": {
"topic": {
"enum": [
"all",
"eligibility",
"deadlines_and_late_relief",
"signatures_and_consent",
"delivery_and_proof"
],
"type": "string",
"description": "Which part to explain. Defaults to all."
}
}
}Whether a US state requires its own S corporation election after federal Form 2553, and any state paperwork or entity-level tax that still applies (New York's Form CT-6, New Jersey, Georgia, DC, Tennessee, New Hampshire and the rest).
| Argument | Type | Description |
|---|---|---|
| state* | string | US state, DC or territory where the business is located, as a two-letter code or name, e.g. 'NY' or 'Texas'. |
{
"type": "object",
"required": [
"state"
],
"properties": {
"state": {
"type": "string",
"description": "US state, DC or territory where the business is located, as a two-letter code or name, e.g. 'NY' or 'Texas'."
}
}
}FileMyScorp's Form 2553 filing service and its one-time prices by delivery method (fax, USPS Certified Mail with tracking, or both), what is included, and the flat per-client rate for tax professionals.
No arguments.
{
"type": "object",
"properties": {}
}Finds FileMyScorp's plain-English guides on S corporations and Form 2553 by topic, e.g. 'late election', 'reasonable salary', 'S corp vs LLC', 'CP261', 'state election', 'basis'. Returns titles, summaries and links.
| Argument | Type | Description |
|---|---|---|
| query* | string | What the person wants to know. |
{
"type": "object",
"required": [
"query"
],
"properties": {
"query": {
"type": "string",
"description": "What the person wants to know."
}
}
}The IRS service center, fax number and mailing address for Form 2553 for a business in a given US state, DC or territory: the address the IRS instructions print, plus the street address of the same center that USPS Certified Mail can validate.
| Argument | Type | Description |
|---|---|---|
| state* | string | US state, DC or territory where the business is located, as a two-letter code or name, e.g. 'NY' or 'Texas'. |
{
"type": "object",
"required": [
"state"
],
"properties": {
"state": {
"type": "string",
"description": "US state, DC or territory where the business is located, as a two-letter code or name, e.g. 'NY' or 'Texas'."
}
}
}We read every tool's name, description and inputs the way the model will, looking for instructions hidden from you. A clean result means no warning signs, not a guarantee. Scanned Nov 15, 2026.