S-Corp Tax Preparation Services: A Guide for Small Business Owners
Running an S-corp offers real tax advantages — but it also introduces filing requirements that go beyond a standard small business return. S-corp tax preparation services cover the entity-level Form 1120-S, the owner’s personal Form 1040, the K-1 coordination between both, and the payroll that every S-corp owner must run. Additionally, many S-corp owners also manage rental properties, 1099 contractor income, and quarterly estimated tax payments. The Bookkeeping Company has prepared S-corp returns for small businesses since 2016.
By Maya Primachenko, Founder · Last updated August 2026
S-Corp Tax Preparation Services: What the Return Involves
An S-corporation files Form 1120-S, a federal information return, each year. However, the S-corp itself does not pay federal income tax directly. Instead, it passes income, deductions, credits, and losses through to each shareholder on a Schedule K-1.
The Reasonable Salary Requirement
Every S-corp shareholder who works in the business must pay themselves a reasonable salary before taking any distributions. The IRS actively audits S-corps that pay little or no owner salary. As a result, the S-corp must process payroll, withhold FICA taxes, and file quarterly Form 941 returns alongside the annual 1120-S. This requirement surprises many new S-corp owners.
Fortunately, your payroll records already exist in QuickBooks if you use it for your business. However, if you do not yet have payroll running, you need to set it up before the first distributions of the year. A bookkeeper or CPA can help you determine a defensible reasonable salary. (IRS — S Corporations)
How the K-1 Flows to Your Personal Return
The K-1 you receive from your S-corp shows your share of income, deductions, and credits. You then report this income on Schedule E of your personal Form 1040. Furthermore, your K-1 income qualifies for the Section 199A qualified business income deduction — which, as of 2026, is permanent under the One Big Beautiful Bill Act. However, to claim the full 20% deduction, your income must fall below the applicable threshold for your filing status.
What S-Corp Tax Preparation Services Include
S-corp tax preparation services from The Bookkeeping Company cover every deliverable in a complete S-corp filing cycle:
- Form 1120-S preparation — the entity return due by March 15; we calculate net income, apply deductions, and produce K-1s for every shareholder
- Owner Form 1040 — your personal return, including K-1 income from the S-corp, Schedule E, any business credits, and the QBI deduction
- State entity returns — S-corps in Oregon, Washington, California, and other states file state-level returns alongside the federal 1120-S; we coordinate these so deadlines align
- Reasonable salary documentation — we help you establish and document a defensible salary level based on your industry and the duties you perform
- Payroll integration — because S-corp payroll directly affects the 1120-S, we reconcile your W-2 wages against the return before filing
- S-corp election guidance — for businesses considering the election, we model the projected tax savings against the added compliance cost before you file Form 2553
In addition, S-corp returns connect directly to bookkeeping. Clean, reconciled books make the entire 1120-S preparation process faster and more accurate. See how The Bookkeeping Company’s bookkeeping service feeds into a faster tax season.
Tax Preparation for Real Estate Investors
Real estate investors face a different set of tax rules than S-corp shareholders. However, the two often overlap when a real estate investor also runs another business through an S-corp.
Schedule E and Rental Property Deductions
Rental income and expenses appear on Schedule E of your personal return. As a result, you track rental income, mortgage interest, property taxes, insurance, repairs, property management fees, and depreciation separately for each property. Depreciation, in particular, can significantly reduce your taxable rental income. For example, a residential property depreciates over 27.5 years, which generates a deduction each year even when the property’s market value rises. (IRS — Rental Income and Expenses)
Passive Activity Rules and 1031 Exchanges
The IRS classifies most rental activities as passive income. Therefore, rental losses generally offset only other passive income — not wages or S-corp income. The exception applies if you qualify as a real estate professional or meet the active participation rules. Furthermore, selling an investment property can trigger capital gains taxes. You can defer those gains through a 1031 exchange, provided you follow specific timelines and use a qualified intermediary.
In addition, high-income real estate investors may owe the 3.8% Net Investment Income Tax on rental profits. Your tax preparer needs to account for this when estimating your total liability for the year.
Tax Preparation for 1099 Contractors
1099 contractors report their business income and expenses on Schedule C of their personal Form 1040. Unlike W-2 employees, they also owe self-employment tax. The rate is 15.3% on net income up to $168,600, then 2.9% above that threshold.
Key Deductions for 1099 Contractors
Fortunately, 1099 contractors can deduct a wide range of business expenses. For example, home office deductions apply when you use a dedicated space regularly and exclusively for business. Similarly, you can deduct business vehicle mileage, equipment, tools, professional subscriptions, and any ordinary and necessary business expense. Additionally, 1099 contractors who pay for their own health insurance can deduct those premiums above the line on their personal return.
Furthermore, self-employed individuals can contribute to a SEP-IRA, Solo 401(k), or SIMPLE IRA, which reduces both income tax and self-employment tax simultaneously. As a result, retirement planning is one of the highest-impact tax moves available to a 1099 contractor. (IRS — Self-Employment Tax)
How Quarterly Estimated Taxes Work for Small Businesses
S-corp owners, 1099 contractors, and real estate investors all share one common obligation: they must pay quarterly estimated taxes instead of relying on employer withholding.
The Quarterly Payment Schedule
The IRS requires estimated tax payments four times per year. Specifically, payments are due April 15, June 15, September 15, and January 15. Each payment covers approximately one quarter of your projected annual federal income tax and self-employment tax. If you underpay, the IRS charges an underpayment penalty on your annual return. However, you avoid the penalty if your payments meet the safe harbor — either 100% of last year’s tax liability or 90% of this year’s, whichever is smaller. (IRS — Estimated Taxes)
Calculating Your Estimated Payment
To calculate each payment accurately, you need a current picture of your year-to-date income, deductions, and credits. Consequently, clean monthly bookkeeping produces far more accurate quarterly estimates. Businesses working from memory or year-end totals consistently overpay or underpay. If your income fluctuates, you can adjust each quarterly payment based on actual income for that period. This is more accurate than dividing last year’s tax by four.
How Much Do S-Corp Tax Preparation Services Cost?
S-corp tax preparation costs depend on return complexity and the number of state filings required. According to the National Society of Accountants Income and Fees Survey (2025):
- Form 1120-S (S-corp entity return): approximately $903 or more; this is separate from the owner’s personal return
- Owner’s Form 1040 with K-1 income: approximately $220 to $323 for the base return; additional schedules (E for rental income, C for contractor income) add to the fee
- Real estate investor Schedule E: additional fee per property; depreciation schedules and passive loss calculations add scope beyond a standard return
1099 Contractor and Estimated Tax Preparation Fees
- 1099 contractor Schedule C: approximately $482 or more when combined with the Form 1040
- Quarterly estimated tax planning: typically bundled with the annual preparation or available as an add-on for clients who need quarterly income reviews
In general, working with a firm that handles both bookkeeping and tax preparation eliminates the cost of coordinating between two separate providers. Combined bookkeeping and tax preparation at The Bookkeeping Company means your annual return draws from reconciled records — no separate cleanup process required.
The Bookkeeping Company prepares S-corp returns, partnership returns, real estate investor returns, and 1099 contractor returns remotely via secure document portal. If you would like to talk through your specific situation, you can reach the team at 360-524-9889.
Frequently Asked Questions About S-Corp Tax Preparation Services
What does business tax preparation cost?
S-corp tax preparation typically costs $903 or more for the Form 1120-S entity return, plus a separate fee for the owner’s personal Form 1040 (Source: National Society of Accountants, 2025). Additionally, real estate investors with multiple properties pay more due to per-property depreciation schedules, and 1099 contractors with Schedule C returns pay approximately $482 or more. However, bundling annual tax preparation with year-round bookkeeping typically costs less than engaging a separate CPA for returns alone.
CPA vs tax preparer — which do I need?
A tax preparer handles return preparation and filing. CPAs, in contrast, provide return preparation plus tax strategy, advisory services, and audit representation with the full authority of a licensed accountant. For S-corp owners with multiple income streams, the most practical approach is a firm that combines bookkeeping and tax preparation. As a result, you get accurate records throughout the year and a prepared, informed tax return — without coordinating between two separate providers.
Do you handle S-corp and partnership returns?
Yes. The Bookkeeping Company prepares Form 1120-S for S-corporations, Form 1065 for partnerships, and Schedule C for sole proprietors. Moreover, these entity returns coordinate with the owners’ personal Form 1040 — covering K-1 income, the permanent Section 199A QBI deduction, and reasonable salary documentation. State-level returns for Oregon, Washington, California, and other applicable states are included.
Quarterly Taxes, Real Estate, and S-Corp Value
Can you help with quarterly estimated taxes?
Quarterly estimated taxes apply to S-corp owners, 1099 contractors, real estate investors, and anyone whose withholding does not cover their tax liability. The Bookkeeping Company calculates your estimated obligation based on projected annual income. Federal estimated tax payments are due April 15, June 15, September 15, and January 15. As a result, clients avoid underpayment penalties and avoid sending in lump sums at filing time that disrupt cash flow.
Do you support real estate and 1099 filers?
For real estate investors, the firm prepares Schedule E for rental income, calculates depreciation schedules, applies passive activity loss rules, and documents 1031 exchange positions. Clients with 1099 contractor income receive Schedule C profit and loss preparation, self-employment tax filing, home office and vehicle deductions, and quarterly estimated tax planning. Furthermore, clients with both an S-corp and rental properties receive a coordinated return package that addresses all income sources on a single engagement.
Is an S-corp worth it for a small business?
An S-corp election generally makes financial sense when a business generates net income consistently above approximately $40,000 per year. At that level, SE tax savings from salary-plus-distributions typically exceed the added cost of an S-corp return. Payroll processing costs factor into that calculation as well. However, the exact break-even depends on your income level, filing status, and state tax obligations. The Bookkeeping Company can model the projected S-corp tax savings before you file Form 2553.
1099 Contractor and Recordkeeping Questions
How do quarterly estimated taxes work for a 1099 contractor?
1099 contractors do not have income tax or self-employment tax withheld from client payments. Instead, they pay estimated taxes directly to the IRS four times per year. Each payment covers roughly 25% of the year’s expected federal income tax plus the 15.3% self-employment tax. Furthermore, most states require separate estimated tax payments for state income tax on the same schedule. Underpaying estimated taxes results in an IRS underpayment penalty calculated on the annual return, even if you pay the full balance due by April 15.
What records do I need before tax preparation?
For S-corp owners: the prior year 1120-S return, full-year bookkeeping records, payroll W-2s for all owner-employees, and K-1s from any partnerships or investments. Real estate investors need: rental income totals, mortgage interest statements, property tax records, repair and maintenance receipts, and prior year depreciation schedules. Additionally, 1099 contractors should gather: all 1099-NEC forms received, a profit and loss statement or bank records, and documentation for each deducted expense.
About The Bookkeeping Company
The Bookkeeping Company: Tax Strategies & Planning
18523 NE 65th St
Vancouver, WA 98682
Phone: 360-524-9889
Email: thebookkeepingcomp@gmail.com
Service Area: Serving small businesses, S-corp owners, real estate investors, and 1099 contractors nationwide. All tax preparation delivered remotely via secure document portal.