New Business Owners: Even When Cash Feels Tight, You Still Need to Make Estimated Tax Payments
One of the most expensive surprises I see with newer business owners is the underpayment-of-estimated-tax penalty.
Many people assume: “I didn’t make that much this year” or “Cash is tight right now, so I can wait.”
That thinking often leads to an unexpected bill, plus penalty, when the tax return is filed the following year.
How Estimated Taxes Actually Work
Both the IRS and New York State expect you to pay tax throughout the year as you earn income. If you don’t have enough withheld from a paycheck, you are usually required to make quarterly estimated tax payments.
There is a helpful “safe harbor” rule. In most cases you can avoid the underpayment penalty if you pay at least:
90% of the tax you will owe for the current year, or
100% of the tax shown on your prior-year return (110% if your prior-year income was over certain thresholds)
For many newer or growing businesses, the prior-year number is the safer and easier target.
The Trap Many New Owners Fall Into
Here’s the typical pattern:
The business is only a few years old.
Last year’s tax was solid.
This year a new income source appears (rental property, a spouse returning to work, a big project, or simply stronger business results).
Estimated payments are calculated (or not calculated) based only on the old numbers.
The vouchers sit unpaid or the amounts are too low.
When the return is filed the following year, an underpayment penalty appears.
The prior-year safe harbor only protects you if the money is actually paid on time.
Why a Cash Flow Budget That Includes Estimated Taxes Is Critical
Paying estimated taxes is not just a tax issue. It is a cash flow issue.
If the quarterly payments are not built into your cash flow budget, they feel like a surprise every time they come due. That is when owners start skipping payments or paying late, which creates the penalty.
A practical cash flow budget should:
Show the four estimated tax due dates clearly
Treat the estimated tax payments as a fixed “must-pay” item (just like rent or payroll)
For sole proprietors and single-member LLCs, record those payments as owner draws when they come out of the business account so they are tracked properly and do not distort business profit
Leave enough cushion so the business can still operate after those payments leave the account
Be updated when new income sources appear (rental income, spouse’s wages, larger contracts, etc.)
When the estimates are calculated automatically (through good bookkeeping software or a living spreadsheet tied to your actual numbers), two things happen:
You see the real impact on cash flow months ahead of time.
The payments become a planned outflow instead of a last-minute scramble.
Married Filing Jointly Makes Planning Even More Important
If you file jointly, all household income counts. A new job for your spouse, a side hustle, investment income, or rental income can raise the current-year tax even if the business itself is flat. Those changes need to be reflected in both the estimated tax calculation and the cash flow budget.
What I Recommend
Build a simple rolling cash flow budget that includes the four estimated tax payments as fixed outflows.
Have your tax advisor or bookkeeper calculate the quarterly amounts automatically based on the prior-year safe harbor and any new income sources.
Review the numbers mid-year and adjust if income is running significantly higher or lower than expected.
Set the payments up as automatic transfers or calendar reminders so they actually leave the account on time.
Estimated taxes are part of owning a business. When they are planned for in your cash flow budget and calculated automatically, they stop being a source of stress and start being just another manageable number.
Ready to Take Control of This?
If your income has changed this year (new rental property, stronger business results, a spouse’s new job, or anything else), let’s revisit your estimated tax payments now so you stay on track and avoid next year’s penalty.
Or, if you want the bigger picture, I can help you build a simple cash flow budget that includes the quarterly estimated tax amounts as planned outflows (and properly records them as owner draws if you’re a sole proprietor or single-member LLC).
Either way, the goal is the same: no surprises.
Call or email me and we’ll get your numbers working for you instead of against you.
Own Your Numbers.
Nina Guidi, CPA, CIA
nina@ninaguidicpa.com | (315) 520-8299
This article is for general information only and is not tax, legal, accounting, or insurance advice for your specific situation. Rules depend on your facts and current law. Talk with your CPA and, when needed, an attorney before you file, elect, or change anything.