Summary: Smart tax planning is a year-round activity, not just a pre-April scramble. By mid-year, you have enough income data to project your tax liability and adjust strategies like withholding, retirement contributions, and tax-loss harvesting. The 2026 landscape under the One Big Beautiful Bill Act (OBBBA) introduces new deductions and limits, making proactive planning more valuable than ever. This article outlines actionable steps to shape your finances before tax season arrives.
For most Americans, taxes are a twice-a-year thought: once in April when filing, and again in December when it’s often too late to do much about it. But the most effective tax planning happens long before the W-2s and 1099s arrive in the mail.
August is a sweet spot for tax planning . You’re far enough into the year to have a clear picture of your income trajectory, but you still have enough time to make meaningful adjustments . Waiting until December often means missed opportunities — decisions like retirement contributions, estimated tax payments, and charitable giving are locked in once the calendar flips .
Why Mid-Year Is the Sweet Spot for Tax Planning
The calendar says August, but the tax-planning calendar says start now . By mid-year, you have six months of income data to work with. As Tim Steffen, director of tax planning at Baird, explains: “You’re far enough into the year that you’ve got a pretty good handle on what your year is going to look like. But you’ve got enough time left to make adjustments” .
Mark Steber, chief tax officer at Jackson Hewitt, recommends using your June 30 paystub as a clean snapshot. “Take your June 30 information and double it,” he advises. “You can run your numbers and get a pretty good approximate guess of what your 2026 taxes will look” .
This mid-year checkpoint is particularly important in 2026. The OBBBA, signed into law in July 2025, introduced significant changes including a new SALT deduction cap of $40,000 through 2029, a $6,000 bonus deduction for seniors, and deductions for tips and overtime income . Understanding how these provisions affect your specific situation requires proactive evaluation.
Adjust Withholdings Before It’s Too Late
One of the simplest yet most overlooked tax planning moves is adjusting your W-4 payroll withholdings. If you had an unexpectedly large tax bill or refund this year, your withholding may be off .
Common triggers for updating your W-4 include :
- A new job or major income shift
- Marriage, divorce, or a new child
- Changes to your filing status
- A side hustle generating taxable 1099 income
The IRS recently updated its withholding estimator to reflect OBBBA changes, making it especially worthwhile to revisit your W-4 this year . The goal is to aim for little to no refund or balance due come Tax Day — not a surprise bill or an interest-free loan to the government.
Set Aside Money for Non-W-2 Income
If you run a side gig, freelance, or sell items through online marketplaces, your income may not be subject to tax withholding. Now is the time to estimate your annual income from these sources and start setting aside money to cover the tax bill .
This is especially important given the OBBBA’s changes to 1099-K reporting. The law permanently restored the reporting threshold to $20,000 and 200 transactions, meaning casual sellers may not receive a form — but all income from goods or services remains taxable regardless of whether you receive a 1099 . Don’t let the absence of a form lull you into thinking the income isn’t reportable.
Tax-Loss Harvesting: Don’t Wait Until December
Tax-loss harvesting is most often associated with December, when investors scramble before the year-end deadline. But waiting until December has drawbacks: opportunities that existed earlier in the year may have disappeared, and a crowded year-end can lead to rushed decisions .
Reviewing your portfolio at mid-year gives you a natural checkpoint to assess unrealized losses while there is still time to act thoughtfully . If you’ve realized capital gains — which have been plentiful given strong stock market performance — now is the time to scour your portfolio for losers to offset those gains .
How Tax-Loss Harvesting Works
Here’s a simplified example: Suppose an investor has realized $10,000 in capital gains earlier in the year. Reviewing the portfolio at mid-year, they identify a separate holding sitting at a $7,000 unrealized loss. By selling that position, they realize the $7,000 loss, which offsets a portion of the gains. The taxable gain falls from $10,000 to $3,000 .
If your losses exceed your gains, you can use up to $3,000 of net losses to offset ordinary income per year, with any excess carrying forward to future years indefinitely .
The Wash-Sale Rule: A Critical Pitfall
The most important rule to understand is the wash-sale rule. The IRS prohibits claiming a loss if you buy the same security — or one that is “substantially identical” — within 30 days before or after the sale that produced the loss. Counting the sale date itself, that creates a 61-day window .
A detail many investors miss: the wash-sale rule applies across all accounts you and your spouse control, including IRAs. Buying a substantially identical security in your IRA shortly after harvesting a loss in your taxable account can still trigger the rule .
Retirement Contributions: The Roth Shift
The 2026 contribution limits have increased: you can contribute $24,500 to a 401(k), with an $8,000 catch-up for those 50 and older, and an additional $11,250 “super catch-up” for those ages 60-63 .
But the bigger change is the “rothification” of the 401(k). Beginning in 2026, if you’re 50 or older and earned more than $150,000 in FICA wages in 2025, your catch-up contributions must be made as Roth (after-tax) contributions . This means no more pre-tax catch-up contributions for higher earners — the extra $8,000 (or more) will be taxable today .
While this removes some flexibility, it’s not necessarily a bad thing. For many high earners in their 50s, building Roth exposure helps create tax bracket control in retirement, reduces lifetime RMD pressure, and provides a hedge against future tax increases . In other words, SECURE 2.0 may be forcing some tax diversification that many investors arguably needed anyway .
The HSA Opportunity
Health Savings Accounts are often treated as benefit-plan side notes, but if you’re eligible, that’s a missed opportunity. For 2026, the HSA contribution limit is $4,400 for self-only coverage and $8,750 for family coverage .
If you can afford to pay current medical costs from cash flow, an HSA can be a powerful long-term planning account. Contributions may be deductible or made pretax through payroll. Growth is tax-deferred. Distributions are tax-free when used for qualified medical expenses .
Roth Conversions: Run the Numbers Now
Summer is a good time to evaluate whether a Roth conversion makes sense. Any dollars converted from a traditional retirement plan to a Roth are taxed as ordinary income, so you want to run the numbers to see if the math works .
Recent retirees who are no longer earning a paycheck are best positioned for a Roth conversion. “They’re in the golden zone of having very low income,” says Steber. That means you can convert more dollars to a Roth at lower tax rates and enjoy them later in life with tax-free withdrawals .
Under the OBBBA, a new $6,000 senior deduction is also available for taxpayers age 65 and older, creating additional “room” in lower tax brackets that may make conversions more attractive .
Business Owners: Entity Structure and Deductions
For business owners, mid-year is an ideal time to revisit entity structure. S corporations allow owners to set a reasonable salary, potentially reducing self-employment tax . If you’re a sole proprietor netting $180,000 and switch to an S corporation with a $100,000 reasonable salary, you could save roughly $8,000–$10,000 in self-employment taxes annually .
The Qualified Business Income (QBI) deduction is also worth reviewing. A commonly overlooked opportunity occurs when a business owner operates two related businesses but does not make an “aggregation election” — which can allow both businesses to be treated as one for qualifying for a larger QBI deduction .
Frequently Asked Questions
1. Why is mid-year a good time for tax planning?
By mid-year, you have enough income data to project your annual tax liability, but you still have time to make adjustments to withholdings, retirement contributions, and investment strategies .
2. How do I check if my withholding is correct?
Review your June 30 paystub and double the income and withholding figures to estimate your annual tax liability. The IRS also offers a free withholding estimator that has been updated for OBBBA changes .
3. What is tax-loss harvesting and why does timing matter?
Tax-loss harvesting involves selling investments at a loss to offset capital gains and up to $3,000 of ordinary income. Reviewing your portfolio at mid-year lets you act on losses before they recover and avoids a rushed year-end scramble .
4. What is the wash-sale rule and how do I avoid it?
The wash-sale rule disallows a loss if you buy a “substantially identical” security within 30 days before or after the sale. To avoid it, wait 31 days to repurchase, or buy a different but not “substantially identical” security .
5. What changed with 401(k) catch-up contributions in 2026?
If you’re 50 or older and earned more than $150,000 in 2025, your 2026 catch-up contributions must be made as Roth (after-tax) contributions .
6. What is the 2026 HSA contribution limit?
The limit is $4,400 for self-only coverage and $8,750 for family coverage, with a $1,000 catch-up for those 55 and older .
7. Should I consider a Roth conversion in 2026?
A Roth conversion may make sense if you expect to be in a lower tax bracket this year — for example, if you’re recently retired. Run the numbers with a tax professional to evaluate the benefit .
8. What are the new OBBBA deductions I should know about?
Key provisions include a $40,000 SALT cap, a $6,000 senior deduction, deductions for tips (up to $25,000) and overtime (up to $12,500), and a $10,000 deduction for auto loan interest .
9. What is the QBI aggregation election?
If you operate multiple businesses, you may be able to elect to treat them as one for purposes of the Qualified Business Income deduction, potentially increasing your deduction amount .
10. Why should I set aside money for taxes on side income now?
If your side income isn’t subject to withholding, you’ll owe taxes on it when you file. Setting aside money throughout the year prevents a cash crunch at tax time and may help you avoid underpayment penalties .
From Reactive Filing to Proactive Planning
The difference between a tax bill that surprises and a return that rewards often comes down to timing. Waiting until the final weeks of the year — or worse, until April — means many of the most valuable tax-saving opportunities have already passed . August offers the ideal balance: enough income data to project your liability, but enough time to act . Whether it’s adjusting withholdings, harvesting losses, or optimizing retirement contributions, the moves you make now can shape your financial outcomes for the entire year.
Key Takeaways:
- August is the tax planning sweet spot — you have enough data to project but time to adjust
- Check your withholding using your June 30 paystub and the IRS estimator
- Set aside money for side income to avoid a cash crunch at tax time
- Review your portfolio for tax-loss harvesting opportunities before they disappear
- Understand the new Roth catch-up rules if you’re a high earner age 50+
- Evaluate Roth conversions and business entity structures while there’s still time
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