Why the first 75 days
The decisions with a date on them.
Most of these cannot be reversed with a phone call. The ones that can be fixed later usually cost more to fix than to get right now.
S-corp election
A single-member LLC is taxed as a sole proprietorship by default; a multi-member LLC as a partnership; a corporation as a C-corp. Form 2553 changes that, but it is due within 2 months and 15 days of the date the first tax year starts — the earliest of having shareholders, holding assets, or doing business. Miss it and the election generally takes effect next year unless late-election relief applies. New York needs its own election (Form CT-6); New Jersey follows the federal one.
New York LLC publication
New York LLCs must publish a notice of formation in two newspapers for six consecutive weeks within 120 days of formation, then file a Certificate of Publication with the Department of State. It is a formality with a real cost — the county of the office address sets the price — and the authority to carry on business in New York is suspended until it is done.
New Jersey registration and annual report
Forming a New Jersey entity is not the same as registering it for tax. Form NJ-REG registers the business with the Division of Revenue for income, sales and employer taxes, and an annual report is then due each year by the end of the anniversary month of formation. Missing reports eventually lead to administrative revocation.
NYC Unincorporated Business Tax
An LLC taxed as a sole proprietorship or partnership that carries on business in the five boroughs can owe the 4% UBT on top of state and federal tax. There is a credit that removes it at lower income levels, and the answer changes if the entity is taxed as a corporation — New York City does not recognize the federal S election, so an S-corp pays the city’s corporate tax instead.
Quarterly estimates
Nothing is withheld from an owner’s profit. Federal estimated payments fall on April 15, June 15, September 15 and January 15; New York and New Jersey run their own schedules. The first one that falls after the business has income is the one most new owners miss, and the underpayment interest is charged from that date.
Owner pay
In a default LLC the owner takes draws and pays self-employment tax on the profit. In an S-corp the owner-employee must be paid reasonable compensation through payroll before taking distributions. The right answer depends on profit, payroll cost and state rules, and it has to be set up before the first payment, not reconstructed in April.
Rules and dates reflect federal, New York and New Jersey guidance as of November 2026 and can change. General information, not tax advice for your situation.