NY Estimated Tax

Section 1 -- Quick reference

Section 1 -- Quick reference (Form IT-2105-I (2025))

Field	Value
State	New York
Tax	Quarterly estimated income tax (state + NYC + Yonkers) plus MCTMT estimated payments when applicable
Forms	IT-2105 (voucher), IT-2105.9 (underpayment penalty)
Primary legislation	NY Tax Law Section 685
Supporting legislation	NYC Admin Code 11-1701; NY Tax Law Art. 30-A (Yonkers); NY Tax Law Art. 23 (MCTMT)
Authority	New York State Department of Taxation and Finance (NYSDTF)
Portal	www.tax.ny.gov
Currency	USD only
Income-tax threshold	NYS, NYC, or Yonkers estimated income tax after withholding/credits >= $300
MCTMT threshold	Estimated MCTMT payments required if any MCTMT is expected after partnership-paid MCTMT
Safe harbors	90% current year OR 100%/110% prior year
Payment schedule	April 15, June 16, September 15, January 15
Contributor	Open Accountants Community
Validated by	July 2026
Validation date	July 2026

Payment schedule (TY2025) (Form IT-2105-I (2025))

Instalment	Due date
1st	April 15, 2025
2nd	June 16, 2025
3rd	September 15, 2025
4th	January 15, 2026

Key rates (Form IT-2105-I (2025))

Item	Value
MCTMT Zone 1 (self-employed)	0.60% of Zone 1 NESE if Zone 1 NESE exceeds $50,000
MCTMT Zone 2 (self-employed)	0.34% of Zone 2 NESE if Zone 2 NESE exceeds $50,000
NYC top resident rate	3.876%
Yonkers resident surcharge	16.75% of NY state tax
110% prior-year threshold	Prior-year NYAGI or prior-year MCTD NESE > $150,000 ($75,000 if MFS)
2025 underpayment penalty rate	9.5% for Apr 15, 2025 through Apr 15, 2026

Conservative defaults (https://www.tax.ny.gov/pdf/2025/inc/it2105_9i_2025.pdf)

Ambiguity	Default
Prior year NYAGI unknown	Assume > $150K, use 110% safe harbour
MCTMT zone uncertain	Confirm county of self-employment
NYC residency unclear	Do not include NYC tax unless confirmed NYC resident
UBT credit available	Include only if taxpayer files NYC UBT return
Annualized method	Default to equal instalments; flag annualized option for reviewer

Section 2 -- Required inputs and refusal catalogue

Required inputs

• Minimum viable inputs — expected NY state tax, NYC tax (if applicable), MCTMT (if applicable), prior year NY tax return, expected withholding. (https://www.tax.ny.gov/pdf/2025/inc/it2105i_2025.pdf)
• Recommended inputs — prior-year NYAGI and prior-year MCTD NESE (for 110% test), filing status, county of self-employment (for MCTMT zone), NYC UBT credit estimate. (https://www.tax.ny.gov/pdf/2025/inc/it2105i_2025.pdf)
• Ideal inputs — complete prior year IT-201, current year income projection, W-2 withholding estimates, NYC UBT return data.
• Refusal policy if minimum is missing — SOFT WARN. Without prior year data, the safe harbour cannot be computed.

Refusal catalogue

• R-NY-ET-1 -- Corporate estimated tax (CT-400) — Trigger: corporation. Message: "Corporate estimated tax has different rules."
• R-NY-ET-2 -- Partnership/fiduciary estimated tax — Trigger: partnership or trust. Message: "Partnership and fiduciary estimated tax are outside this skill."
• R-NY-ET-3 -- PTET estimated payments — Trigger: pass-through entity tax. Message: "PTET estimated payments are outside this skill."
• R-NY-ET-4 -- Non-resident filers — Trigger: non-resident of NY. Message: "Non-resident estimated tax has different rules."

Section 3 -- Payment pattern library

This is the deterministic pre-classifier for bank statement transactions. When a debit matches a pattern below, classify it as a NY estimated tax payment.

3.1 NYSDTF estimated tax debits

NYSDTF estimated tax debits (https://www.tax.ny.gov/pdf/2025/inc/it2105i_2025.pdf)

Pattern	Treatment	Notes
NYS TAX, NY STATE TAX, NYSDTF	NY estimated payment	Match with Apr/Jun/Sep/Jan timing
IT-2105, IT2105	NY estimated payment	Form number reference
NEW YORK ESTIMATED TAX	NY estimated payment	Explicit description
TAX.NY.GOV PAYMENT	NY estimated payment	Online payment

3.2 Timing-based identification

Timing-based identification (https://www.tax.ny.gov/pdf/2025/inc/it2105i_2025.pdf)

Debit date range	Likely instalment	Confidence
10 April -- 20 April	1st instalment	High if NY tax payee
10 June -- 20 June (June 16 statutory/observed due date for 2025)	2nd instalment	High
10 September -- 20 September	3rd instalment	High
10 January -- 20 January	4th instalment	High

3.3 Related but NOT NY estimated tax

Related but NOT NY estimated tax

Pattern	Treatment	Notes
IRS, FEDERAL ESTIMATED	EXCLUDE	Federal estimated tax
NYC DOF, NYC PROPERTY	EXCLUDE	NYC property tax
NY SALES TAX	EXCLUDE	Sales tax payment
NYS PENALTY, NYS INTEREST	EXCLUDE	Penalty/interest
IT-201 BALANCE	Flag for reviewer	Annual return balance, not estimated

Section 4 -- Worked examples

Example 1 -- Standard NYC freelancer

Standard NYC freelancer component table (https://www.tax.ny.gov/pdf/2025/inc/it2105i_2025.pdf)

Component	Amount
NY state tax	$6,500
NYC tax	$3,800
MCTMT	$720
Total	$11,020

Input: Single NYC resident. NYAGI $120,000. NY tax $6,500. NYC tax $3,800. MCTMT $120,000 x 0.60% = $720 because Zone 1 NESE exceeds the $50,000 threshold. No withholding.

Required: 90% x $11,020 = $9,918 (or 100% prior if lower). Quarterly: $2,479.50 (round voucher payments to whole dollars).

Example 2 -- High-income, 110% prior year

Input: Single. NYAGI $200,000. Current year total $18,000. Prior year $14,000.

Computation: 90% current = $16,200. 110% prior = $15,400. Required = $15,400 (lesser). Quarterly = $3,850.

Example 3 -- Below threshold

Input: NYC resident. Estimated NYS/NYC/Yonkers income tax after withholding = $250 and no MCTMT expected.

Output: $250 < $300 income-tax threshold and MCTMT = $0, so no estimated payments required.

Example 4 -- Yonkers resident

Input: Yonkers resident. NY state tax $5,000. Yonkers surcharge = $5,000 x 16.75% = $837.50.

Output: Include $837.50 in estimated tax total.

Example 5 -- MCTMT Zone 2 only

Input: Westchester resident (Zone 2). NESE $80,000.

Output: MCTMT = $80,000 x 0.34% = $272 because Zone 2 NESE exceeds the $50,000 threshold.

Section 5 -- Computation rules

5.1 Determine total estimated tax

• Total estimated tax formula — total_estimated = NY_state_tax + NYC_tax + Yonkers_tax + MCTMT net_estimated = total_estimated - expected_withholding - credits if income_tax_net_estimated < 300 and no MCTMT is expected: no estimated payments required; if MCTMT is expected, include MCTMT estimated payments even if income-tax estimated payments are below $300 (https://www.tax.ny.gov/pdf/2025/inc/it2105i_2025.pdf)

5.2 Required annual payment

• Required annual payment rule — Required annual payment = lesser of 90% of current-year tax, or 100% of prior-year tax (110% if prior-year NYAGI or prior-year MCTD NESE exceeded $150,000; $75,000 if MFS). The prior-year return must cover a full 12-month year. (Form IT-2105.9-I (2025))

5.3 Quarterly instalments

• Quarterly instalment rule — Each instalment = required annual payment / 4 (25% each).

5.4 NY state tax computation

• NY state tax computation — Federal AGI + NY additions - NY subtractions = NYAGI. Apply NY rate schedule (4% to 10.9%). Subtract NY credits.

5.5 NYC resident tax

• NYC resident tax computation — NYC taxable income x NYC rates (3.078% to 3.876%). Subtract NYC household credit and UBT credit.

5.6 MCTMT

• MCTMT computation — For self-employed individuals in the MCTD, test each zone separately. If allocated NESE in Zone 1 exceeds $50,000, MCTMT is 0.60% of the Zone 1 allocated NESE base. If allocated NESE in Zone 2 exceeds $50,000, MCTMT is 0.34% of the Zone 2 allocated NESE base. Do not subtract the $50,000 threshold from the taxable base. (Form IT-2105-I (2025))

5.7 Yonkers

• Yonkers tax computation — Resident: 16.75% of NY state tax. Nonresident working in Yonkers: 0.5% of Yonkers-source earnings.

Section 6 -- Penalties and interest

6.1 Underpayment penalty

• Underpayment penalty rule — Computed on Form IT-2105.9. For tax year 2025, the penalty rate is 9.5% for each period from April 15, 2025 through April 15, 2026. The statutory formula is the federal short-term rate plus 5.5 percentage points, with a 7.5% floor, adjusted quarterly. (Form IT-2105.9-I (2025))

6.2 Safe harbour protection

• Safe harbor protection rule — No underpayment penalty applies if withholding and estimated payments meet the required annual payment: the smaller of 90% of 2025 tax or 100%/110% of 2024 tax, with the 110% rule triggered by prior-year NYAGI or MCTD NESE above $150,000 ($75,000 if MFS). (Form IT-2105.9-I (2025))

6.3 Annualized income instalment method

• Annualized income instalment method rule — IT-2105.9 allows annualized method for uneven income. Computes income actually earned through each quarter-end. Reduces early-quarter payments for seasonal freelancers. (https://www.tax.ny.gov/pdf/2025/inc/it2105i_2025.pdf)

Section 7 -- Filing and payment procedure

Paper vouchers: Form IT-2105 mailed to NYSDTF.

Online: Pay at www.tax.ny.gov (no voucher needed).

Prior year overpayment: Applied to reduce 1st quarter payment. Document on voucher.

Section 8 -- Edge cases

Prior-year NYAGI or prior-year MCTD NESE above $150,000 ($75,000 if MFS) requires 110% of prior-year tax (not 100%).

MCTMT is on Form IT-201 (Lines 54a/54b). NOT a separate filing.

IT-219 credit reduces NYC estimated tax. Include when estimating.

Prior year safe harbour = $0. Use 90% current year.

Seasonal freelancer: use IT-2105.9 to reduce early-quarter payments.

Applied to 1st quarter estimated payment.

Section 9 -- Self-checks

Before delivering output, verify:

• $300 income-tax threshold applied correctly and MCTMT tested separately
• All tax layers included (state + city + Yonkers + MCTMT as applicable)
• 110% prior-year rule applied when prior-year NYAGI or MCTD NESE exceeds $150,000 ($75,000 if MFS)
• MCTMT computed with correct zone rate and $50,000 threshold-as-trigger (not an exemption amount)
• NYC UBT credit offset included if applicable
• Quarterly payments divided evenly (25% each)
• Withholding and prior-year overpayment credits subtracted
• Reviewer brief notes which safe harbour method was used
• Due dates confirmed (Apr 15, Jun 16, Sep 15, Jan 15 for TY2025)
• Output labelled as estimated until reviewer confirms

Section 10 -- Test suite

Test 1 -- NYC freelancer

Input: NYAGI $120,000. NY tax $6,500. NYC $3,800. MCTMT $720. No withholding. Expected: Total $11,020. Required 90% = $9,918. Quarterly ~$2,480.

Test 2 -- High-income 110% rule

Input: NYAGI $200,000. Current $18,000. Prior $14,000. Expected: 90% current = $16,200. 110% prior = $15,400. Required = $15,400. Quarterly = $3,850.

Test 3 -- Below threshold

Input: Estimated tax after withholding = $250. Expected: No payments required.

Test 4 -- Yonkers resident

Input: NY state tax $5,000. Expected: Yonkers = $837.50. Include in total.

Test 5 -- MCTMT Zone 2

Input: Westchester. NESE $80,000. Expected: MCTMT = $272.

Test 6 -- First year

Input: No prior NY return. Expected: Prior year safe harbour = $0. Use 90% current.

Prohibitions

• NEVER omit MCTMT from estimated tax calculations
• NEVER use 100% prior-year safe harbour when prior-year NYAGI or MCTD NESE exceeds $150,000 ($75,000 if MFS) -- use 110%
• NEVER estimate NYC tax for non-NYC residents
• NEVER ignore the NYC UBT credit when estimating NYC tax
• NEVER advise on penalty waiver requests -- procedural matter
• NEVER confuse NY estimated tax with federal estimated tax

Disclaimer

This skill and its outputs are provided for informational and computational purposes only and do not constitute tax, legal, or financial advice. Open Accountants and its contributors accept no liability for any errors, omissions, or outcomes arising from the use of this skill. All outputs must be reviewed and signed off by a qualified professional (such as a CPA, EA, tax attorney, or equivalent licensed practitioner in your jurisdiction) before filing or acting upon.

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