4 Money Rules That Just Changed in 2026 – And What to Do Before Year-End

By Than Zaw Oo | March 25, 2026

If you’re like most people, you probably missed a few deadlines last month.

I almost did too.

See, there’s this thing about financial planning that nobody tells you: the rules change when you’re not looking. And 2026? A bunch of rules just changed. Quietly. The kind of quiet that hits your wallet before you even know what happened.

I spent the last week digging through the SECURE 2.0 Act fine print and talking to tax professionals. Here’s what I found – and what you need to do before December 31st.

The Retirement Rule That Just Made Your Taxes Higher

Let me start with the one that caught me off guard.

Starting January 1, 2026, high earners can no longer make pre-tax catch-up contributions to their 401(k). If you’re 50 or older and your FICA wages exceeded $145,000 last year, your catch-up contributions now have to be on a Roth basis [citation:9].

What does that mean in plain English?

You’re losing a deduction. Your taxable income this year just went up.

I talked to a tax planner in Chicago last week who put it bluntly: “I have clients calling me in a panic. They thought they’d get the same deduction they’ve had for years. Now they owe more in April.”

Here’s what you need to check:

– Look at your 2025 W-2. Find box 3 (Social Security wages). If it was over $145,000, this applies to you.
– Log into your 401(k) portal. See what your catch-up contributions are set to. If they’re still pre-tax, you might want to adjust your withholding.
– Talk to your tax person. Seriously. Before December 31st.

One bright spot? Roth money grows tax-free. So in the long run, you’re actually better off. But the short-term tax hit? That’s real [citation:9].

The SALT Deduction Cap Just Went Up – But There’s a Catch

Here’s some actual good news.

Congress temporarily raised the SALT deduction cap to $40,000 through 2029 [citation:9]. If you live in a high-tax state like New York, California, or Illinois, this is a big deal. You can now deduct more of your state and local taxes on your federal return.

But – and you knew there was a but, right? – there’s a phaseout. High earners in the 37% bracket now face a cap on the value of itemized deductions. Your deductions effectively reduce your income at 35%, not 37% [citation:9].

What does this mean for you?

You need to run the numbers. The old “standard deduction is always better” rule doesn’t apply anymore. For some people, itemizing makes sense again. For others, not so much.

A strategy that’s gaining traction? Bunching charitable donations. Instead of giving $5,000 every year, give $15,000 every three years. That way you clear the itemization threshold in one year and take the standard deduction in the others [citation:9].

I’m doing this myself this year. It takes a little planning, but the tax savings are worth it.

The Portfolio Risk Nobody’s Talking About

Okay, this next one isn’t about tax rules. But it might be more important.

Remember how tech stocks crushed it in 2025? Nvidia up 55%. Broadcom up 50%. The whole AI wave [citation:1].

Here’s the problem: if you haven’t rebalanced your portfolio recently, you probably have way more risk than you think.

I looked at my own accounts last month. My tech allocation had drifted from 25% to nearly 40%. I didn’t notice because the gains were gradual. But the risk? That snuck up on me.

Financial advisors are seeing this across the board. One planner told me: “I have clients who think they’re diversified. But when I pull their statements, 60% of their equity exposure is in three AI stocks.” [citation:9]

Here’s what I did – and what you might want to consider:

– Pull your most recent statement. Look at your top 10 holdings. Are you comfortable with that concentration?
– Check your target allocation. If you’re supposed to be 60% stocks and you’re now 75%, that’s a problem.
– Rebalance gradually. You don’t have to sell everything at once. But have a plan.

The market could keep going up. But the question isn’t whether it will. The question is: can you afford to be wrong?

The Liquidity Rule That Could Save Your Retirement

Here’s something I’ve been thinking about a lot lately.

White-collar job markets are changing. Tech, finance, professional services – they’re all seeing more volatility. Layoffs that used to be rare are now quarterly events [citation:9].

I have a friend who worked at a big tech company for 12 years. Got laid off in January. His severance ran out last month. He’s still looking.

Here’s what he told me: “I had plenty of money in my portfolio. But I didn’t want to sell when the market was down. So I had to borrow from family.”

That’s the trap. Marketable assets aren’t the same as cash. When the market is down, selling locks in losses [citation:9].

The rule of thumb used to be: keep 3-6 months of expenses in cash. Now? Advisors are recommending up to 18 months for people in volatile industries [citation:9].

I know that sounds like a lot. But think about it: if you lose your job and the market drops 20%, you don’t want to be selling stocks to pay rent. You want to ride it out.

Where to keep that cash? High-yield savings accounts. Treasury ladders. Money market funds. Anything that’s liquid and not correlated to the stock market.

I just bumped my emergency fund to 12 months. It feels excessive. But I sleep better.

One More Thing: The Social Security Question

I don’t want to be the guy who sounds alarmist. But I’d be doing you a disservice if I didn’t mention this.

Current projections suggest Social Security trust funds could be depleted by 2033. If nothing changes, beneficiaries might only get 77% of promised benefits after that [citation:4].

Now, I’m not saying Social Security is going away. It’s too politically important. But I am saying that relying on it for retirement income might be riskier than it used to be.

What does that mean for you?

If you’re in your 40s or 50s, run your retirement numbers assuming Social Security pays 80% of what’s promised. If you’re still on track, great. If not, you have time to adjust.

If you’re closer to retirement? Your window is narrower. It might mean working a few more years, saving more now, or adjusting your lifestyle expectations.

I ran my own numbers last year. The gap wasn’t huge, but it was there. So I bumped up my savings rate by 3%. It hurt a little. But future me will be grateful.

A Quick Story Before You Go

I have this uncle who retired in 2020. Did everything right. Saved for decades. Paid off his house. Had a solid plan.

Then inflation hit. Then the market dropped. Then his property taxes went up.

We were talking last Thanksgiving, and he said something that stuck with me: “I planned for the risks I could see. I didn’t plan for the ones I couldn’t.”

That’s what 2026 feels like to me. The risks aren’t the ones we’re talking about on TV. It’s the quiet stuff. The tax rule you didn’t know changed. The portfolio drift you didn’t notice. The emergency fund that looked big enough until it wasn’t.

My take? Spend an hour this month looking at the boring stuff. Check your withholdings. Run your allocation numbers. Look at your emergency fund. It’s not exciting. But it’s the kind of work that keeps you from being the person who calls their advisor in a panic next April.

Your 2026 Financial Checklist

If you only have 10 minutes, here’s what to do:

☐ Check your 401(k) catch-up contributions. If you’re over 50 and made more than $145,000 in 2025, your contributions are now Roth. Adjust your withholding so you’re not caught off guard in April.

☐ Look at your top 10 holdings. If more than 30% is in one sector, consider rebalancing. This isn’t about timing the market. It’s about managing risk.

☐ Review your emergency fund. If you’re in tech, finance, or any volatile industry, aim for 12 months of expenses. Yes, that’s more than you were told. Times have changed.

☐ Run your retirement numbers again. Assume Social Security pays 80% of what’s promised. If you’re still on track, great. If not, you have time to adjust.

☐ Talk to your tax person. Before December 31st. The new rules are complicated. Don’t guess.

Today’s Quick Numbers

Source: IRS, Social Security Administration [citation:4][citation:9]

The Bottom Line

2026 is shaping up to be a year of quiet change. The rules are different. The risks are different. And the playbook that worked for the last decade might not work going forward.

I’m not saying you should panic. I’m saying you should pay attention. The people who come out ahead in years like this aren’t the ones who make big, dramatic moves. They’re the ones who do the boring work. Who check the details. Who plan for the risks they can’t see.

That’s what I’m doing. And if you take one thing from this article, let it be this: don’t wait until December to figure this out. The time to look at your finances is now.

Have a question about the new rules? Or a story about how this is affecting your planning? Reply to this email. I read every message.