Bookkeeping for Startups in New York: Requirements, Taxes, and Provider Options

New York is unusual because business taxes apply at several levels. A corporation doing business in New York State owes the state corporate franchise tax under Article 9-A, calculated on the highest of several bases. If it does business in New York City, it also owes a city tax: the Business Corporation Tax for C corporations (8.85% of allocated business income for most companies, with a fixed dollar minimum starting at $25 for low NYC receipts) or the General Corporation Tax for S corporations.

Partnerships and LLCs taxed as partnerships or disregarded entities that operate in the city are subject to the 4% Unincorporated Business Tax (UBT) instead. Your bookkeeping has to produce numbers that feed each of these returns, which is why a generic chart of accounts often falls short here.

Calendar-year corporations file the state return, Form CT-3, by April 15, and Form CT-5 requests a six-month extension. A corporation with New York receipts of $100,000 or less still owes the state fixed dollar minimum of $25, so even a pre-revenue Delaware C corp with a New York office files and pays. The minimum rises with New York receipts, which is one more reason to track receipts by state every month.

New York treats prewritten software as tangible personal property, and the Department of Taxation and Finance says that selling a New York purchaser a license to remotely access software is subject to state and local sales tax. In other words, most SaaS sold to New York customers is taxable even though it feels like a service.

The sale is sourced to where the customer uses the software. If a customer has users both inside and outside New York, the seller collects tax on the New York portion. Your books should separate revenue by product and by customer location so you can see where you have economic nexus and what is taxable, rather than discovering the exposure during diligence.

For example, suppose a startup sells a $60,000 annual subscription to a customer with 100 users, 40 of them in Manhattan and 60 in other states. The New York portion is 40%, or $24,000. At New York City's combined 8.875% rate (the 4% state rate plus local and Metropolitan Commuter Transportation District taxes, per Publication 718), the tax to collect is $2,130. Without user-location data in the CRM or billing system, you cannot support that 40% allocation if the Department asks.

Apply for a Certificate of Authority at least 20 days before you start making taxable sales in New York. Registration runs through New York Business Express. A company with an office or employees in New York has physical presence and registers once it sells taxable items, including SaaS.

Remote sellers register under an economic test. You must register if, in the four preceding sales tax quarters, you had more than $500,000 of gross receipts from sales of tangible personal property delivered into New York and more than 100 such sales. Both conditions must be met. New York's sales tax quarters are offset from the calendar: March through May, June through August, September through November, and December through February.

Most startups start as quarterly filers on Form ST-100, due 20 days after each quarter ends (June 20, September 20, December 20 and March 20). If taxable sales and purchases subject to use tax reach $300,000 in a quarter, you move to monthly (part-quarterly) filing from the next month, and it is your job to notify the Department. Keep sales tax payable in its own account so the return ties to the ledger.

Payroll in New York has a few line items that do not exist in many other states.

• Paid Family Leave (PFL). Funded by employee payroll deductions. For 2026 the contribution is 0.432% of gross wages, up to $411.91 a year (2025 was 0.388%, up to $354.53). The Department of Financial Services resets the rate each year, so update payroll when the new rate is published.
• Metropolitan Commuter Transportation Mobility Tax (MCTMT). An employer-paid tax once payroll expense in the Metropolitan Commuter Transportation District exceeds $312,500 in a calendar quarter. The district covers all five NYC boroughs (Zone 1) and seven suburban counties (Zone 2). For quarters beginning on or after July 1, 2025, Zone 1 rates run from 0.055% to 0.895% depending on quarterly payroll. Employers file Form MTA-305 by April 30, July 31, October 31 and January 31, with no extensions.
• Disability insurance and unemployment insurance. Both need their own liability and expense accounts.

Two examples show the arithmetic. An employee earning $120,000 in 2026 would owe $518.40 of PFL at 0.432%, but the deduction stops at the $411.91 cap. A Brooklyn startup with $400,000 of quarterly payroll falls in the $375,000 to $437,500 band, so its MCTMT for the quarter is 0.115% × $400,000 = $460.

Book these to separate accounts so the quarterly filings reconcile to the general ledger.

For a New York startup, accrual-basis bookkeeping with a well-structured chart of accounts is the baseline. Track:

• Revenue by customer location, for sales tax and for state and city receipts allocation
• Deferred revenue for annual subscriptions
• Research expenses, which feed the federal R&D credit and New York incentives such as the Excelsior R&D credit
• Payroll by work location for employees split between the city, the rest of the state and other states

Clean monthly closes give you the financials investors expect and the detail your tax preparer needs for the state and city returns.

A New York month-end close adds a few local steps to the standard routine:

1. Reconcile bank, card and payroll clearing accounts.
2. Roll forward deferred revenue for annual subscriptions and recognize the month's revenue.
3. Pull SaaS and other taxable revenue by customer location and reconcile sales tax payable to the next ST-100 or part-quarterly return.
4. Check quarterly payroll in the commuter district against the $312,500 MCTMT threshold.
5. Reconcile PFL, disability and unemployment liability accounts to payroll reports.
6. Update receipts by state and by New York City for the CT-3 and city allocation workpapers.

We suggest aiming to close within ten business days of month end. The steps that slip are usually 3 and 6, and those are the ones a diligence team asks about first.

You have three realistic options: hire an in-house bookkeeper, use a national startup-focused firm, or work with a local New York accountant. In our view, in-house rarely makes sense for an early-stage company until volume clearly justifies a full-time hire.

A national startup specialist gives you software-native bookkeeping and people who understand SaaS metrics and venture reporting. Confirm they actually handle New York State and New York City filings, not just federal. Whoever you choose should know the UBT, the Business Corporation Tax and General Corporation Tax, and New York's sales tax on software, because those are where New York startups most often get tripped up.

The rules above were checked against tax.ny.gov, nyc.gov and the New York Paid Family Leave site in October 2026. This is general guidance, not tax advice for your specific facts.