Income tax basics for watch dealers

Tax isn't the exciting part of dealing watches, but getting it wrong is expensive, and the basics are more approachable than they look. This article covers how federal income tax generally works for a US dealer operating as a sole proprietor or single-member LLC. It's general information, not advice for your situation. An accountant who knows your circumstances should have the final word.

You're taxed on profit, not sales

A dealer who sells a watch hasn't earned the sale price. They've earned the difference between what the watch sold for and what it cost, less the other costs of running the business. Income tax follows that logic: it's charged on your business's net profit.

That's why your cost records matter. Every watch's purchase price, and the costs of getting it ready to sell, reduce your taxable profit, but only if you can show them. The cost basis article explains what goes into a watch's cost.

Reporting on Schedule C

A sole proprietor reports business income and expenses on Schedule C, filed with their personal return. A single-member LLC that hasn't chosen to be taxed as a corporation generally does the same, because it isn't treated as a separate entity for federal income tax purposes.^[1]

The form's instructions also draw the line between a business and a hobby: an activity counts as a business when your main purpose is income or profit and you're involved in it with continuity and regularity, and sporadic or hobby activity doesn't qualify.^[1] A dealer buying and selling regularly for profit is running a business.

Cost of goods sold

For a dealer, the biggest deduction is usually the cost of the watches you sold. Schedule C has a dedicated section for cost of goods sold, based on your inventory at the start and end of the year and what you bought in between.^[1] Watches still in stock at year end aren't deducted yet; their cost counts when they sell.

The instructions also describe simplified inventory methods available to qualifying small businesses.^[1] Which method suits you is a question for your accountant, but whichever you use, it depends on accurate inventory records.

Self-employment tax

On top of income tax, a self-employed person generally pays self-employment tax, which covers Social Security and Medicare. The IRS states the rate as 15.3%, made up of 12.4% for Social Security and 2.9% for Medicare, and requires Schedule SE when net earnings from self-employment are $400 or more.^[2] Part of it, the employer-equivalent portion, can be deducted when working out adjusted gross income.^[2]

It surprises many new dealers, because nothing is withheld from a sale the way it is from a paycheck.

Estimated tax payments

Because no one withholds tax from your sales, the IRS generally expects self-employed people to pay during the year. Individuals, including sole proprietors, generally have to make estimated payments if they expect to owe $1,000 or more when they file, using Form 1040-ES, across four payment periods.^[3] Paying too little can bring an underpayment penalty, even if you end up due a refund.^[3]

A simple habit helps: set aside part of the profit from every sale in a separate account, so the money is there when a payment is due.

Platforms report your sales

Marketplaces and payment processors may report payments you receive to the IRS on Form 1099-K.^[4] That form shows gross payments, not profit, so your own records need to reconcile it: which sales it covers, what the watches cost, and what fees came out. The bookkeeping article covers reconciling platform reports.

State and local taxes

Most states have their own income tax, and sales tax is a separate matter entirely. Collecting and remitting sales tax on your sales is covered in the sales tax permit article.

Records are the whole game

Every figure on your return rests on records: what you paid, what you sold for, what you spent. Keep purchase receipts, invoices, platform statements, and expense receipts for every watch. The recordkeeping guide covers what to keep and for how long.