If you earn self-employment income, you've probably considered a few different ways to handle your taxes. The question isn't really which one is best. It's about which one aligns with the strategy you want built into your year, rather than the amount of operational work you're willing to do yourself.
Most self-employed professionals weigh four options: doing it yourself with software, hiring a traditional CPA, using a software-led platform like Collective, or working with Formations. The differences between options are less apparent at filing time and more apparent during the other eleven months of the year.
This is the most common issue our experts we find, and it also has the greatest downside if left unaddressed. An S-Corp is a tax election, not a static structure. It has ongoing requirements that most owners are not actively tracking between tax seasons.
The compliance gaps we see most often:
Any one of these on its own can be corrected with planning. What makes them serious is that they tend to travel together. An owner who pays themselves zero salary often also has no payroll system and no basis tracking, which means the return compounds the same set of problems year over year.
These are different from the compliance issues above. Nothing about the return is technically wrong. The numbers just do not include deductions the filer was legally entitled to take. That is money the IRS was never going to hand back unless the filer asked for it. Five come up again and again.
This is one of the most frequently missed deductions, especially for filers who give throughout the year rather than making a single year-end gift. Recurring monthly donations, one-off cash gifts, and non-cash contributions like donated goods, clothing, or equipment all count, but only if they are documented. When receipts are scattered across email inboxes and paper records, people default to skipping the deduction entirely rather than trying to reconstruct it at tax time.
Self-employed filers often pay for insurance out of pocket and never categorize it as business-related. Health insurance premiums paid for the owner, spouse, and dependents can be deductible for qualifying self-employed filers. Other policies tied directly to the work, like professional liability, business interruption, or disability coverage structured around the business, can also qualify. The common mistake is treating every insurance payment as a personal expense by default.
Most filers assume medical expenses are not deductible, and for most years that is effectively true. Once total qualifying out-of-pocket medical expenses exceed 7.5% of adjusted gross income, though, the portion above the threshold can be itemized. In years with a major surgery, ongoing specialist care, fertility treatment, or a significant dental event, the threshold is easier to hit than people realize. We see these expenses omitted because the filer never ran the math.
Self-employed filers who use a personal vehicle for work are the largest group we see leaving deductions unclaimed. The usual pattern is one of two things. Either mileage was never tracked, so there is no defensible number at tax time, or business driving was tracked inconsistently, and the filer took a conservative guess that underrepresented actual use. Between client meetings, site visits, supply runs, and travel to coworking or office space, real business-use mileage is usually higher than the filer estimates.
The home office deduction is still commonly missed, most often because filers are nervous about taking it or assume it does not apply if they rent. Neither concern is accurate on its own. When a portion of the home is used regularly and exclusively for business, the deduction is legitimate, whether the filer rents or owns. The simplified method calculates it at $5 per square foot up to 300 square feet, which makes documentation straightforward. Filers who skip it often miss out on $1,500 or more in deduction value each year.
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The deductions and compliance issues above are not obscure. Most are covered in basic tax literature. What they have in common is that they require either year-round documentation or an ongoing management process, and most self-employed filers are set up for neither.
A few patterns drive the misses:
S-Corp compliance drifts for similar reasons. The election is made once, then nothing formal happens between filings. Payroll, basis tracking, reasonable compensation reviews, and separation of personal and business spending all need ongoing attention, not a yearly rush.
Every issue covered comes back to the same root cause. Tax preparation alone cannot catch them. By the time a preparer sees the numbers in March, the year is already closed, and the documentation either exists or it does not.
The filers who consistently avoid these issues are not more disciplined or more tax-savvy. They have a team working on their books, payroll, and strategy throughout the year, not just at filing time.
That is what Formations does. Our team handles S-Corp compliance, strategy, and return preparation that actually reflects what you are entitled to claim. Formations clients save an average of $14,801 per year because nothing slips through the cracks.
→ Meet with a Formations expert to have your prior return reviewed and see what a year-round setup would look like for your business.
The five that come up most often in Formations' tax return reviews are charitable contributions, insurance premiums, medical expenses above the AGI threshold, mileage and vehicle expenses, and the home office deduction. Each one tends to be missed because it requires year-round documentation rather than tax-time recall.
Yes. The IRS allows taxpayers to file an amended return (Form 1040-X) up to three years after the original filing date, or two years after the tax was paid, whichever is later. It is worth working with a tax professional before amending, since the amendment should be supported by documentation.
The most common signs are paying yourself no salary or a very low one, having no formal payroll system, co-mmingling personal and business expenses, and not tracking shareholder basis between years. If any of these apply, the return is likely not reflecting the S-Corp structure correctly.
Yes. The home office deduction applies to both renters and owners, as long as the space is used regularly and exclusively for business. The simplified method calculates the deduction at $5 per square foot up to 300 square feet, with no difference in eligibility based on ownership versus renting.
Reasonable compensation is what a comparable employee would be paid for the same work in the same market. The IRS does not publish a single number, but factors include the owner's role, time commitment, training, and industry comparables. Paying significantly below that range is one of the top audit triggers for S-Corps.
For self-employed filers, and especially S-Corp owners, a mid-year check-in is the minimum. An annual review is reactive. A mid-year review allows compensation adjustments, estimated tax payments, and strategy changes to be made while the year is still open.
Most of what we find in tax return reviews is not dramatic. It is small things, the kind that build up quietly over a few filing cycles and add real dollars to a tax bill. Catching them is less about scrutinyexpertise and more about having a process that looks at the same set of questions every year.