Tax Preparation Built Around Your Books

Self-employment tax adds another 15.3 percent on top of income tax for anyone filing a Schedule C or a partnership return, which is often the single biggest number small business owners aren't expecting the first time they see it.

None of this is a reason to avoid filing carefully. It's why tax preparation services for small business owners have to do more than transcribe numbers into a form. The return has to hold up if it's ever reviewed, which means every deduction traces back to a bookkeeping record, not a guess made in April.

Small business filing deadlines follow the same calendar every year, with the exact date depending on entity type and whether an extension was filed. Partnerships and S-corporations file by March 15, extended to September 15. Individual returns and calendar-year C-corporations file by April 15, extended to October 15. Quarterly estimated tax payments are due April 15, June 15, September 15, and January 15 of the following year.

Monily takes on small business tax preparation at every point on this calendar, a return that's on time, on extension, already late, or planning ahead for next year.

Every return that leaves Monily is prepared or reviewed by a Monily tax practitioner, and Monily is an IRS CAA. Preparers hold a valid PTIN, the IRS-issued number required of anyone paid to prepare a federal return.

If a return is ever questioned, the tax practitioner who prepared it assists you and provides audit support, rather than handing you off to find someone else after the fact. That's worth asking about, not just whether someone can fill out a form.

Tax preparation looks at a year that's already over and reports it as accurately as possible. Tax planning happens during the year, so there's less to report when preparation season arrives. They aren't the same service, and a business that only ever prepares, never plans, tends to pay more than it has to.

A tax planning consultation with Monily covers entity structure, whether an LLC taxed as an S-corporation would save more in self-employment tax than it costs to administer, the timing of income and expenses around a year end, retirement contribution strategy through a solo 401(k) or SEP IRA, and a quarterly review that adjusts your estimated payments as revenue changes instead of waiting until the return is due to find out you underpaid. Year-round tax support means those quarterly check-ins happen automatically once you're a bookkeeping client, not as a call you have to remember to book yourself.

A few deductions come up often enough in small business returns that they're worth naming directly, because they're also the ones most often missed or claimed incorrectly on a self-prepared return.

• Home Office: If part of your home is used regularly and exclusively for business, you can deduct a portion of rent or mortgage interest, utilities, and insurance based on the square footage used, using either the simplified method or actual expenses, whichever produces a larger deduction.
• Vehicle and Mileage: Business use of a personal vehicle is deductible either at the standard mileage rate or based on actual expenses, but only with a mileage log or comparable record kept through the year. A log reconstructed in April rarely holds up as well as one kept as you go.
• Section 179 and Bonus Depreciation: Equipment, vehicles over a certain weight, and some software purchased and put into use during the year can often be deducted in full in the year of purchase rather than depreciated over several years, within IRS limits that change periodically.
• Retirement Contributions: A SEP IRA or solo 401(k) reduces taxable business income while building retirement savings, and the contribution deadline for a SEP IRA can extend to the filing deadline, including extensions, which makes it one of the last levers available after a year has already ended.
• Self-Employed Health Insurance: Owners who pay for their own health insurance and aren't eligible for an employer plan through a spouse can often deduct the full premium against business income, a deduction that's frequently missed on self-prepared returns.
• Startup and Organizational Costs: Costs incurred before a business officially opened, including market research, legal fees, and initial marketing, can often be partially deducted in the first year and amortized over time for the remainder.

Employees have tax withheld from every paycheck. Business owners don't, which means the IRS expects estimated payments four times a year instead of one payment at filing time. The general safe harbor is met by clearing either of two thresholds, spread across the four due dates. Those are 90 percent of the current year's tax, or 100 percent of last year's tax, 110 percent if last year's adjusted gross income was more than $150,000 (or $75,000 if married filing separately). Whichever threshold is lower is the one that applies. Missing this isn't just a cash flow problem. It triggers an underpayment penalty calculated separately from whatever is owed with the return itself.

The businesses that find this most disruptive are usually the ones with income that swings during the year, a strong quarter followed by a slow one, or a business that grew faster than its estimated payments kept up with. A quarterly review, the kind included in ongoing tax planning, catches that shift before the fourth quarter payment rather than after the return is filed and the shortfall is already locked in.

Entity structure decides more of a small business's tax bill than almost any single deduction. A sole proprietorship or single-member LLC reports on a Schedule C and pays self-employment tax on the full net profit. Electing S-corporation status lets an owner split income between a reasonable salary, which is subject to payroll tax, and a distribution, which isn't, often reducing the total tax owed once net profit clears a few tens of thousands of dollars. The tradeoff is added cost and complexity, including payroll processing, a separate corporate return, and stricter recordkeeping, which is why the decision is usually a numbers exercise specific to your actual profit rather than a default answer.

This is also where tax preparation and tax planning connect most directly. A preparer filing a return in April can tell you what last year's structure cost you. A planning conversation earlier in the year is what actually changes the number for the year ahead.

Not every tax filing service for small business owners is built the same way, and the differences tend to show up after the return is filed rather than before. A service worth using should include an experienced tax practitioner, a second review of the return before it's filed, a complete copy of the return and its schedules delivered to you, and someone who can assist you and provide audit support if the IRS follows up. A tax filing service for small business that stops at "we'll file it for you" is leaving out the part that matters if anything goes wrong afterward.

Coming to an intake call with the right documents shortens the whole process. Useful items include last year's tax return, a profit and loss statement and balance sheet for the year being filed, any 1099s or W-2s received, a mileage log or vehicle expense summary, records of any equipment or vehicle purchases during the year, and retirement contribution records if applicable. If your books aren't current, that's fine to say upfront. Getting them current is often the first step, and that's a normal starting point, not a delay.

Filing isn't the end of the relationship for clients on a year-round plan. If an IRS notice arrives, our tax practitioners assist you and provide audit support, so you're not left to interpret it alone. Quarterly reviews adjust estimated payments as the year's income becomes clearer, and if a prior return needs to be amended, whether to correct an error or to claim a deduction that was missed, the same team that filed the original return handles the amendment. Tax preparation that ends the moment a return is accepted is only doing half the job a small business actually needs from it.

Monily has prepared tax returns alongside bookkeeping and accounting work since 2006, for more than 5000 businesses across 15-plus industries, with a 4.4-star rating on Google. Experienced tax practitioners, Monily's status as an IRS CAA, and a planning option that doesn't stop at the filing deadline are what most owners are comparing when they search for the best tax service for small business.

If Monily already keeps your books, your return is prepared by someone who has looked at your numbers all year, not a stranger opening a stack of PDFs for the first time in March. If Monily doesn't keep your books yet, we can still prepare a clean return from what you bring us, and the bookkeeping conversation can wait until you're ready for it.