Tax API

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9 endpoints in this group.

GET /api/tax/due-dates

Get Due Dates

Parameters

Responses

POST /api/tax/federal

Calculate Federal

Calculate federal income tax liability.

Request body: application/json

Responses

POST /api/tax/net-income

Calc Net Income

Calculate net LLC income for the tax year (Section 475(f) ordinary income). Includes car deduction (prorated), all LLC deductions, and NOL (80% cap).

Request body: application/json

Responses

GET /api/tax/payments

List Payments

List estimated tax payments. P0-8: limit capped at 100.

Parameters

Responses

POST /api/tax/payments

Log Payment

Request body: application/json

Responses

POST /api/tax/quarterly-estimate

Quarterly Estimate

Compute estimated quarterly tax payment.

Implements:

• YTD P&L annualization based on days_elapsed
• Full SE tax (Schedule SE) — no longer stubbed to 0
• NOL carryforward with 80% TCJA cap
• Child tax credit with phase-out
• Safe-harbor comparison (Method 1 vs Method 2) — picks lower
• Penalty risk traffic light (green / amber / red)
• State tax estimate

Request body: application/json

Responses

POST /api/tax/safe-harbor

Safe Harbor

Calculate IRS safe-harbor payment.

Method 1: 100% of prior-year tax (110% if prior AGI > $150,000). Method 2: 90% of current-year projected tax. Recommended: whichever is LOWER (IRS allows either).

Request body: application/json

Responses

POST /api/tax/se-tax

Calc Se Tax Endpoint

Calculate Schedule SE self-employment tax. Returns se_tax, deductible_half, and se_income_subject.

Request body: application/json

Responses

POST /api/tax/send-reminder

Send Reminder

Send quarterly tax payment reminder email.

Parameters

Responses