Tax work for engineering professionals

Nobody picks their classification by preference. The IRS applies a common law test in three parts: behavioral control, meaning who directs how the work gets done; financial control, meaning who supplies the tools, who can realize a profit or a loss, and whether you are free to take other clients; and the type of relationship, meaning written contracts, benefits, and permanence. A firm that sets your hours, seats you at their desk, and supervises the work has an employee, whatever the agreement is titled.

On the worker's side the arithmetic is simple and routinely skipped. As a 1099 contractor you pay self-employment tax of 15.3% on 92.35% of net earnings up to the Social Security wage base, then 2.9% Medicare with no ceiling, plus another 0.9% above $200,000 single or $250,000 joint. A higher contract rate is not a raise until you subtract the employer half of FICA, the unemployment coverage you no longer have, the retirement match you gave up, and health insurance at retail. Sometimes it is still a raise. Run it before you sign, not in April.

If you are the one paying subcontractors out of your own shop, the exposure runs the other direction: back employment taxes and penalties on every worker who belonged on payroll. Section 530 relief can protect a business that had a reasonable basis for its treatment and filed its 1099s consistently. It does nothing for a business that filed none.

Working from home as a W-2 employee produces no federal deduction. The TCJA suspended miscellaneous itemized deductions, which is where unreimbursed employee business expenses lived, and they have not come back. The move that works is an accountable plan reimbursement under Reg. 1.62-2: you substantiate the expense, the employer reimburses it, and it is tax-free to you and deductible to them. A few states did not follow the federal suspension, so it is worth checking if you itemize on a state return.

For contract work the space has to be used exclusively and regularly for business. A spare bedroom holding the guest bed and the exercise bike does not qualify, and saying so now is easier than defending it later. The simplified method pays $5 per square foot up to 300 square feet, so $1,500 at the ceiling, with no depreciation and nothing to recapture. The regular method on Form 8829 usually deducts more, but the depreciation you claim comes back as unrecaptured Section 1250 gain when you sell the house, and the Section 121 exclusion does not shelter it.

If your year is one W-2, the standard deduction, and no contract work, commercial software will produce the same return I would and charge you less for it. I will tell you that on the call. A single 1099-NEC for a weekend of drafting work, with nothing else moving, is a Schedule C you can handle yourself.

Where it stops being a software problem: W-2 and contract income in the same year, an entity election you are weighing, equipment you want characterized correctly the first time, work performed in more than one state, or a project that ran long enough to move your tax home. Those are judgment calls with real money behind them, and software does not make judgment calls. If you want to know which side of that line you are on, the fit page is blunt about who this practice is not for, and the pricing page explains how the fee gets set before you commit to anything.