Many people have enough saved for retirement to claim Social Security later than they do, according to a study in the Journal of Pension Economics & Finance.
That's significant: Your monthly Social Security check will typically be three-quarters larger if you claim at 70 instead of at 62.
Many people who wind up with a smaller Social Security check because they claim their benefit early could have waited longer to file, thanks to funds in their individual retirement account.
That's the finding from a recently published study in the Journal of Pension Economics & Finance.
"It seems like there is a significant portion of the population claiming early even though they have the potential to finance a delay," said Gopi Shah Goda , a co-author of the study and the deputy director and senior fellow at the Stanford Institute for Economic Policy Research.
More than a third of beneficiaries who claim their Social Security before 66 — the current full retirement age for most people — have enough money in an IRA to finance the equivalent of at least two years of Social Security benefits, the researchers found. A quarter of them had enough to finance at least four years.
More from Personal Finance:
Legislation would expand this student loan forgiveness program
Congress may gut the 'stretch IRA' wealthy people love
I owed the IRS after making this mistake in college
An IRA is a tax-advantaged investment account in which you can contribute up to $6,000 a year (older savers can put away more). You can start withdrawing from the account at 59½, without penalties, although you will owe income taxes on the amount taken out.
The researchers studied tax data on individuals between the ages of 59 and 71 from the 1940 birth cohort. They also found that other available liquid assets, including stocks, bonds and certificates of deposit, could help people postpone their claiming date further still.
Delaying your Social Security is one of the best ways to expand your retirement income. Your monthly check from the government will often be three-quarters larger if you claim at 70 instead of at 62, said Laurence Kotlikoff, an economics professor at Boston University and the author of " Get What's Yours: The Secrets to Maxing Out Your Social Security ."
Some people might not want to drain their IRA, fearing they'll be slapped with a large medical bill at some point, Shah Goda said. You can withdraw a lump sum from your IRA, of course, whereas your Social Security is paid in monthly installments.
Others might worry that Social Security will not be available to them down the road, she said. "Any type of reform would almost certainly protect people close to retirement age, and would not be conditional on whether people have claimed or not," she said.
To be sure, there are some instances in which claiming your Social Security early makes sense , such as if you know you're not going to live that long.
Others will file as soon as they turn 62 out of necessity, but, Slott said, "if you don't need it, why take something now when you can lock in a much bigger check for life later?"
More From CNBC