Equipment before December 31
Section 179 and bonus depreciation may be worth a conversation if a purchase can be delivered and ready to use this year. Wisconsin may not follow the federal bonus rules.
Talk with your CPA
Know which tax moves to ask your CPA about before Dec 31.
YEWO (say it YEE-woh) · Year-End Write-Offs
Enter your business numbers. Get a short list of possible strategies, estimated savings, deadlines, and a tidy packet for your CPA. Suggestions only, never tax advice.
Dec 31, 2026: last day for most 2026 actions.
Built for small business owners: sole proprietors, LLCs, S-corps, partnerships, and families with more than one business. Copperholm Labs LLC, Wisconsin.
1. Answer questions
One topic at a time. Every question can be marked “I’m not sure.”
2. See possible moves
The check sorts possible strategies and shows a savings range plus the cash cost.
3. Bring the packet
Download a PDF your CPA can mark up: pursue, not applicable, or need info.
Examples of what the list can include
These examples are illustrations. They are not a finding about your business. Talk with your CPA.
SEP-IRA or Solo 401(k)
A profitable owner-only business may have room to set retirement money aside. A day-job 401(k) shares the deferral limit. Employees change the picture.
Talk with your CPA
Hiring your children
Real, age-appropriate work, paid at a reasonable rate, can be a business expense. The Social Security rules depend on the type of business.
Talk with your CPA
Health Savings Account
An HSA-eligible high-deductible plan has a contribution limit. The money can often be added until the April filing date.
Talk with your CPA
About YEWO
YEWO is pronounced YEE-woh. It is short for Year-End Write-Offs. Copperholm Labs LLC, in Wisconsin, makes it so a small-business owner can walk into a CPA meeting with a short list. It does not prepare a return.
What YEWO will not do
- It will not prepare or file a tax return.
- It will not tell you a deduction applies to you.
- It will not pick a “right” S-corp salary.
- It will not add the savings ranges together.
The rules behind the ranges are version 2026.1-draft and are pending CPA review.
Questions people ask first
How do you say YEWO?
YEWO is pronounced YEE-woh. It is short for Year-End Write-Offs.
Is this tax advice?
No. YEWO is education. It lists possible strategies, rough savings ranges, and questions so you can have a shorter conversation with a licensed CPA. It does not prepare a return and it does not tell you what to do.
Do you need my tax return?
No. You type estimates, or a simple profit-and-loss CSV. YEWO does not ask for a Social Security number, a bank login, or a copy of a return.
What does it cost?
This version is free. A paid year-end pass may come later. Nothing is charged here, and there is no account to create.
Where do my answers go?
They stay in this browser until you clear them. Closing the tab does not send them to Copperholm Labs.
Are the 2026 numbers final?
No. The limits are pending CPA review. Every results screen says so. Wisconsin tax is estimated only when you live in Wisconsin, from the 2026 Form 1-ES instructions, and that estimate is still pending CPA review.
Who is this for?
Built for small business owners: sole proprietors, LLCs, S-corps, partnerships, and families with more than one business. A household can include a spouse’s separate business and a W-2 job.
What about C-corporations?
C-corporations: we flag items, but ask your CPA. The check can record a C-corp and will note where the rules differ, such as payroll tax on family wages. It does not prepare Form 1120 or estimate C-corp tax.
A short note on buying equipment
Buying something your business truly needs before Dec 31 lowers your taxes now. The article walks through what has to be true, including the Wisconsin question.
Read the note