Planning When the State Takes No Income Tax
In South Dakota there is no state income tax to plan around, so almost every income tax decision is a federal one. The state's taxes fall on sales, contracts, property and payroll instead, and those affect pricing, bidding and cash flow more than the annual return. Good planning here looks at both sides. BOMCAS meets with owners during the year, not just at filing time, to decide what to do before the year closes.
Entity Choice and Owner Pay
Because South Dakota does not tax business income, the choice between a sole proprietorship, partnership, S corporation or C corporation usually comes down to federal tax, liability, financing and plans for selling or passing on the business. For many profitable owner-operated businesses, an S corporation election can reduce self-employment tax, as long as the owner takes a reasonable salary through payroll. That salary brings payroll costs, including South Dakota reemployment assistance tax on the first $15,000 of wages. We run the numbers both ways before recommending a change, and we look at whether operations in a neighbouring state with an income tax would change the answer.
Equipment Purchases and Depreciation
Farms, ranches, contractors and trucking firms often make large equipment purchases. Federal law now allows a permanent 100 percent bonus depreciation deduction for qualified property acquired after January 19, 2025, and a Section 179 limit of $2,500,000 that phases out above $4,000,000 of qualifying purchases. That allows a lot of flexibility, but deducting everything in one year can waste deductions in a low-income year or leave nothing for later years. We plan purchases against projected income, and we remember the state side: farm machinery used exclusively in agriculture is subject to South Dakota's farm machinery excise tax, and other equipment carries sales or use tax.
Planning for the 2027 Sales Tax Rate Change
Under current law, the state sales tax rate goes from 4.2 percent to 4.5 percent on July 1, 2027, and counties may adopt an option tax of up to 0.5 percent from January 1, 2027. That affects more than the register:
- Long-term service contracts and subscriptions that bill across the change date.
- Fixed-price bids and contracts priced today but billed after the change.
- Large taxable purchases, where timing may change the tax paid.
- Menu, price and quote templates that show tax-inclusive prices.
Contractor's excise tax stays at 2 percent of gross receipts, but because gross receipts include sales tax collected from the customer, a higher sales tax rate also raises the excise tax base. We help businesses review contracts and pricing before the change.
Retirement and Investment Planning
With no state tax on retirement income or capital gains, South Dakota residents plan mainly around federal brackets. We look at Roth conversions in low-income years, the timing of required minimum distributions, qualified charitable distributions from IRAs, and the extra $6,000 deduction available to taxpayers 65 and older from 2025 through 2028, which phases out above $75,000 of modified adjusted gross income ($150,000 joint). Business owners also review retirement plans such as SEP and 401(k) plans that reduce federal tax and help keep employees.
Moving to South Dakota
People who move to South Dakota from a state with an income tax often want to know when to sell a business, exercise options or take a large distribution. The answer depends on the former state's sourcing rules and on whether the move is complete. Planning before the move, and keeping clear records of the move date and ties cut, protects the expected result. See our personal tax preparation page for domicile records.
Farm and Ranch Succession
Agricultural families plan over decades. Farm income averaging can smooth high-income years. Farmers who earn at least two-thirds of their gross income from farming can avoid quarterly estimates by paying once by January 15 or filing and paying by March 1. Transfers of land and machinery to the next generation raise federal gift and estate tax questions and income tax basis questions. We coordinate with the family's lawyer and lender so the tax side supports the succession plan.
Year-End Planning Checklist
- Project federal taxable income for the year and the next.
- Decide on equipment purchases and the depreciation method.
- Review owner salary, distributions and retirement plan contributions.
- Check estimated tax payments and safe-harbour amounts.
- Confirm sales tax, excise tax and use tax are current and reconciled.
- Look for income or activity in neighbouring states that could create new filings.
How Planning Engagements Work
We usually meet two or three times a year: after the return is filed, at mid-year and before year end. Each meeting ends with a short written list of decisions and deadlines. Planning is tailored to each client's facts, and nothing on this page is advice for a particular situation.
South Dakota Tax Planning Questions
Is an S corporation a good idea in South Dakota?
It can be. With no state income tax, the decision is mainly federal: an S corporation can reduce self-employment tax if the owner takes a reasonable salary through payroll. Payroll costs, including reemployment assistance tax, are part of the comparison.
How does the 2027 sales tax increase affect my business?
Under current law the state rate rises from 4.2 to 4.5 percent on July 1, 2027. Contracts, subscriptions and bids that bill after that date, tax-inclusive pricing and large purchases should be reviewed in advance.
Can I deduct all my new equipment in one year?
Often yes. Qualified property acquired after January 19, 2025 is eligible for 100 percent bonus depreciation, and Section 179 allows up to $2,500,000. Whether you should depends on this year's and future income.
When should tax planning happen?
During the year, before decisions are made. We usually meet after filing, at mid-year and before year end, so purchases, pay and distributions can still be adjusted.
Talk to BOMCAS About Tax Planning in South Dakota
Planning works best with the actual returns in hand, so it usually runs alongside business tax preparation and personal tax preparation, using current figures from bookkeeping. Owner pay decisions run through payroll, purchase timing affects sales and use tax, anyone with unfiled years should settle back taxes and late filing first, and Canadians planning a move should begin with cross-border tax. For a summary of how South Dakota taxes businesses and residents, see the South Dakota accounting and tax overview or our United States services.
Tell us what you need help with and we will reply with next steps. Contact BOMCAS, use the contact form below, call 780-667-5250 or email info@bomcas.ca. You can also go back to the South Dakota overview. This page is general information, not advice for a particular situation.