Guide
The first 90 days after buying a business in New York
Most buyers plan the purchase in detail and the handover barely at all. The result is a predictable first month: obligations that were supposed to be automatic turn out not to be, and the ones with deadlines were the ones nobody was watching.
On this page7 sections
Before closing: the items with lead times
Start here, because two of the most consequential deadlines in a New York acquisition fall before the day you take over — and neither is usually raised by the broker.
The Certificate of Authority is a blocking item. The Tax Department states you "must register with the Tax Department at least 20 days before you begin business", that "You cannot legally make any taxable sales until you have received your Certificate of Authority", and that "A Certificate of Authority cannot be transferred or assigned" — when ownership changes you must apply for your own and cannot use the previous owner's [1] . Read those three together. A buyer who closes on a Friday intending to open on Monday, without having registered weeks earlier, cannot lawfully make a taxable sale on Monday.
| Item | When | Why it cannot wait |
|---|---|---|
| Sales tax Certificate of Authority | At least 20 days before you begin business [1] | Not transferable. You cannot legally make taxable sales without it |
| Bulk-sale notification | At least 10 days before you take possession [2] | It is what protects you from the seller's unpaid sales tax. See the bulk-sale guide |
| Workers' comp, disability and PFL | In force from your first day as employer [3] | Coverage is bound in advance, not on the day. Nothing about it is automatic on a change of ownership |
| Licence transfers or new applications | Industry-specific, often weeks to months | Several New York licences do not transfer at all. Check yours early — this is what usually sets the closing date |
| Payroll, EIN and state employer registration | Before the first payroll run | Your first payroll comes faster than you think, and it is a bad first impression to get wrong |
| Bank accounts, merchant processing, utilities | Before closing | Merchant accounts in particular take longer than buyers expect, and revenue stops without one |
Build the sequence backwards from your first trading day. That single habit prevents most first-month problems, because it turns "what do I do after closing" into "what date does each of these have to start".
Day one
The first day is not for changes. It is for continuity, visibility and the handful of obligations that attach the moment you are the owner.
- Insurance live. Workers' compensation, statutory disability and Paid Family Leave in force [3] , alongside general liability and any cover specific to your industry.
- Tell the staff yourself. In person, on the first day, before they hear it elsewhere. What people want to know is whether their job, their pay and their schedule are changing. Answer those three directly, including if the answer is "not for now, and I will tell you before anything does".
- Tell the customers who matter. The top accounts should hear from you and the seller together, early, not discover it from an invoice with a different name on it.
- Tell the suppliers. Terms are often personal to the previous owner and quietly reset on a change of ownership. Find out before your first order, not after.
- Brief on safety and reporting obligations. If the site handles petroleum, everyone on it needs to know about the 2-hour spill reporting rule from the first day [5] .
- Take control of the keys, codes, accounts and data. Bank access, POS, the accounting file, the website and domain, the social accounts, alarm codes, and every system password. This is tedious and it is much harder in month two.
The first 30 days
| Category | What to do |
|---|---|
| Registrations with deadlines | PBS re-registration within 30 days if the site has petroleum tanks — registrations are not transferrable between property owners [4] . Plus any industry registration your diligence identified |
| Employment | Confirm terms in writing with everyone you have taken on, and put the employment infrastructure in place. See what happens to the employees |
| Unemployment insurance | Confirm your experience rating. It generally follows the business rather than resetting — see the experience rating guide |
| Financial rhythm | Get a weekly cash position going in week one. Not monthly management accounts — a weekly number you look at, because month one is where working capital assumptions get tested |
| Learn the operation | Work the actual jobs. Serve customers, run the till, do the route, sit with the technician. Nothing you read in diligence tells you what this tells you |
| Contracts and renewals | Build a calendar of every lease, licence, insurance and supplier renewal date for the next 24 months. Renewal dates are where inherited problems surface |
Working with the seller — and the ceiling on it
A good transition is the highest-return thing available to you in the first 90 days, and it has a hard limit if you borrowed to buy.
SOP 50 10 8.1 provides that the seller may not remain as an officer, director, stockholder or employee of the business, and that a consultancy is capped at 24 months in aggregate including extensions [6] . So the seller's involvement is a defined, time-boxed consultancy — not an open-ended presence.
Within that, be specific. The failure mode is a transition agreement that buys availability rather than transfer:
- Name the relationships. Which customers, which suppliers, which staff, introduced by when. A list with dates beats "will assist with the transition".
- Name the knowledge. The pricing logic, the seasonal pattern, the reason for the odd-looking arrangement with one supplier. Write it down while the seller is still there.
- Set how you communicate. A standing weekly session for the first month works better than ad-hoc calls, because it makes the questions accumulate rather than interrupt.
- Be clear who decides. From day one, you do. Staff will test this, usually gently and usually early, and a seller still making calls in month two is a business that has not changed hands.
What not to change yet
The strongest instinct after closing is to improve something immediately, partly to prove to yourself that you should have bought it. Resist for 90 days, with a specific exception for anything unsafe or unlawful.
The reason is not caution for its own sake. Every established business contains practices that look wrong from outside and are holding something up:
- A discount that looks careless is what retains the customer who covers your fixed costs.
- A supplier who is more expensive is the one who delivers at short notice in your busy season.
- An inefficient shift pattern is built around the constraint of the person who knows the most.
- A price that has not moved in years has not moved for a reason someone can tell you.
Keep a list instead of acting on it. Write down every change you want to make, dated, with the reason. Then in month four, go through it. Some items will look obviously right and you will do them with a real understanding of the consequences. Others you will quietly delete, and those are the ones that would have cost you.
The 90-day review
Put a date in the calendar now, before closing, for the end of the first 90 days. Then work through it deliberately:
- Compare actual results to the model you underwrote. Revenue, margin, payroll, and above all cash. Where it differs, find out whether the cause is the transition or the business.
- Check customer retention against the top accounts you identified in diligence. Anyone gone quiet is a conversation to have now, not at renewal.
- Check staff retention and mood. Departures in the first 90 days are information about the handover as much as about the people.
- Confirm every filing and registration is complete, with evidence in a file. This is the point where a missed 30-day deadline is still cheap to fix.
- Revisit your working capital position against the assumption you closed on. See the working capital guide.
- Confirm the allocation and tax filings your accountant needs, including Form 8594 for the return covering the year of sale.
- Then take the change list out and start deciding.
The pattern worth internalising
Almost everything that goes wrong in the first 90 days comes from one of two assumptions, both of which feel reasonable and neither of which is true in New York.
The first is that things transfer automatically. Many do not: the sales tax certificate cannot be transferred or assigned [1] , the petroleum bulk storage registration is not transferrable between owners [4] , and across this site's industry guides the same pattern recurs licence by licence.
The second is that obligations start at closing. Several start before it — and the two that matter most, the 20-day registration lead time and the 10-day bulk-sale notice, are counted backwards from days that are not the closing date at all. One runs from when you begin business; the other from when you take possession.
Get those two habits right — assume nothing transfers, and count backwards from the right day — and the rest of the first 90 days is about learning the business you have just bought.
Frequently asked questions
Can I use the seller's sales tax Certificate of Authority?
No. The Tax Department states that a Certificate of Authority cannot be transferred or assigned, and that when ownership changes you must apply for your own — you cannot use the certificate issued to the previous owner. This is the single most commonly missed item on a New York closing, because nothing in the purchase agreement tends to flag it.
How far ahead do I need to register for sales tax?
At least 20 days before you begin business, according to the Tax Department. And the reason the lead time matters is the rule that follows it: you cannot legally make any taxable sales until you have received your Certificate of Authority. So this is not paperwork you catch up on in your first week — it is a blocking item that has to be started well before closing.
What has to happen before closing rather than after?
Three things, at minimum. The sales tax registration, because of the 20-day lead time. The bulk-sale notification, which must be filed at least 10 days before you take possession. And insurance — workers' compensation, statutory disability and Paid Family Leave — which has to be in force from your first day as an employer, not arranged during it.
Do I inherit the seller's unemployment insurance rate?
Usually yes, and buyers are often surprised by it. New York transfers the experience rating with the business, and an asset purchase does not by itself reset it — a transfer of goodwill alone can be enough to carry the rate across. Establish what the rate is during diligence, because it is a real cost you are agreeing to, and it is not visible in the profit and loss as a separate line.
What is the 30-day item people forget?
If the site has petroleum storage tanks, the DEC registration. Registrations are not transferrable from one property owner to the next, and a change-of-ownership application must be submitted within 30 days of the transfer of ownership. It is typically discovered years later at renewal, by which point the facility has been unregistered under its actual owner the whole time.
How long should the seller stay on?
Long enough to hand over the relationships that matter, and no longer than the rules allow. If you are SBA-financed, the seller may not remain as an officer, director, stockholder or employee, and a consultancy is capped at 24 months in aggregate including extensions. Plan the handover inside that ceiling, and be specific about what the seller is actually doing rather than buying vague availability.
What should I not change in the first 90 days?
Anything you do not yet understand the reason for. Every business carries practices that look inefficient and are load-bearing — a discount that holds a major customer, a supplier who is slow but extends terms, a shift pattern built around one person's constraint. Spend the first 90 days finding out why things are the way they are. The changes will still be available in month four, and you will make better ones.
Sources cited on this page
Every mutable number on this page — program caps, tax rules, thresholds, filing deadlines — traces to one of these primary sources. Rules change; check the source before you act on the number.
- 1 NYS Department of Taxation and Finance. Tax Bulletin TB-ST-360: How to Register for New York State Sales Tax. https://www.tax.ny.gov/pubs_and_bulls/tg_bulletins/st/how_to_register_for_nys_sales_tax.htm
- 2 NYS Department of Taxation and Finance. Tax Bulletin ST-360: Purchasers' Obligations to Pay Sales Taxes (Bulk Sales). https://www.tax.ny.gov/pubs_and_bulls/tg_bulletins/st/purchasers_obligations_to_pay_sales_taxes.htm
- 3 NYS Workers' Compensation Board. Employers' coverage requirements. https://www.wcb.ny.gov/content/main/Employers/Employers.jsp
- 4 NYS Department of Environmental Conservation. Petroleum Bulk Storage (PBS) Registration/Renewal — Frequently Asked Questions. https://dec.ny.gov/environmental-protection/hazardous-substance-bulk-storage/forms-instructions/pbs-registration-renewal-faq
- 5 NYS Department of Environmental Conservation. Spill Response & Remediation FAQ. https://dec.ny.gov/environmental-protection/site-cleanup/chemical-petroleum-spills/response-remediation-faq
- 6 U.S. Small Business Administration. SOP 50 10 8.1 — Appendix 15: 7(a) Changes of Ownership. https://www.sba.gov/document/sop-50-10-lender-development-company-loan-programs
Educational only — not legal, tax, lending, or investment advice. Confirm specific rules, rates, and forms with the relevant New York State agency, attorney, CPA, lender, or insurer before acting. See the editorial policy and methodology for how sourcing and review work.