Your 401(k) just got more valuable — as a way to help your tax bill

If your tax refund this year was disappointing, you may be able to do something about it: Contribute more to a retirement fund.

Tax-deductible contributions to 401(k)s, IRAs and other retirement accounts are among the few remaining ways to reduce taxable income if you don't itemize deductions. And few of us do these days: Only about 1 in 10 taxpayers is expected to itemize now that Congress has nearly doubled the standard deduction, tax experts said. That's down from about 1 in 3 before the law changed.

As a result, many of the traditional tips and tricks for reducing tax bills either no longer work or are of limited help. Deductions for mortgage interest, charitable contributions and medical expenses, for example, can be taken only if you itemize. In addition to increasing standard deductions, the tax law enacted in December 2017 also did away with personal exemptions and curbed or eliminated many other common deductions:

• Unreimbursed work expenses, tax-prep fees and job-search costs are no longer deductible.

• Moving expenses aren't deductible unless you are active-duty military.

• Casualty and theft losses are deductible only in a federally declared disaster area.

• State and local tax deductions are capped at $10,000.

Student-loan interest is still deductible if you don't itemize, as are certain self-employment expenses.

You can reduce taxable income by contributing to workplace flexible spending accounts and the health savings accounts that are paired with high-deductible health insurance plans.

Not everyone can take advantage of those deductions, but the vast majority of working people can contribute to retirement plans, said Michael Eisenberg, a CPA personal finance specialist with the AICPA's National CPA Financial Literacy Commission.

If you don't have a workplace plan such as a 401(k), you can make tax-deductible contributions to an IRA as long as you are under 70½ and have earned income, typically from salary, wages or self-employment income, that's at least equal to your contribution. People can put up to $6,000 into an IRA in 2019, or $7,000 if they are 50 or older. (If you or your spouse has a workplace plan, you can still contribute to an IRA, but how much you can deduct depends on your income. Check the IRS site for details.)

Contribution limits are higher for workplace plans such as 401(k)s: $19,000 for 2019, or $25,000 if you are 50 or older. If you have a workplace plan, your company also likely offers matching funds, said Jarod Taylor, a financial counselor in Westerville, Ohio.

Lower-income taxpayers may receive an additional benefit: a tax credit of up to $2,000 for single people or $4,000 for married couples filing jointly that can further reduce the cost of contributions. Tax credits are even more valuable than deductions, and it's rare to get both at the same time.

Credits of 50%, 20% or 10% of retirement contributions are available for singles with adjusted gross income up to $32,000 or $64,000 for a married couple filing jointly.

For many people, tax refunds aren't "extra" money. Every dollar may be needed to catch up on overdue bills or pay for health care.

If that's not the case, though, you could put a chunk of this year's refund into a retirement account. You can do that directly, by opening or contributing to an IRA. Or you can boost your 401(k) contribution and use the refund to help replace money deducted from your paycheck.

If you don't mind a smaller refund and just want to pay less in taxes, another possibility is reducing your withholding and channeling the additional money into your retirement fund, Taylor says.

"You've already been living without that money, so just funnel that off to saving for retirement," Taylor says.

Even small amounts can add up. As traditional pensions become rarer, it's important for most people to save if they want a comfortable retirement.

"You don't want to work for many, many years and wind up, if you can help it, living on Social Security alone," Eisenberg says.