“Waiting to take Social Security is a Janus-like dilemma. You'll receive a higher benefit, but it will cost you if you need to withdraw money from your portfolio.”
Forbes’ recent article, “Social Security Benefits: Getting Paid To Wait,” explains that retirement withdrawals create what money managers call "opportunity risk." This means you could lose money that could otherwise be invested for appreciation.
How do you plan for opportunity cost? To answer this question, you’ll need to look at whether to wait to take Social Security after your “normal” retirement age, which is 66 for most people. If you wait to claim at age 70, you’ll see the largest-possible Social Security benefit. If you’re not working, you’ll probably be withdrawing money from your retirement funds, which means that those funds won’t be able to grow for a period of several years. As a result, you’ll need to weigh the opportunity cost of not having funds growing tax-deferred in your retirement accounts, against the larger Social Security benefit you will eventually get.
The math isn’t always easy to calculate, but there’s a simple, indirect rule of thumb that Social Security provides. It is known as “delayed retirement credits.” Based on your birth year, Social Security will give you a bonus for waiting to claim benefits. Take a look at how that works:
Delayed Retirement Credits
Year of birth Credit per year
1943 and later 8.0%
So if you were born after 1943, for every year you wait to claim benefits after age 66 or so, you get an 8% bump in potential benefits up until age 70. That can be a sweet deal, especially if your portfolio isn’t giving you that kind of return. If it’s doing better than that (after taxes), then you might want to leave as much money as you can in your own savings.
If you elect to work, you can build up a larger nest egg, avoid withdrawals and take Social Security later for the maximum benefit. However, not everybody can work later, nor will they be able to plan to delay retirement withdrawals or Social Security. However, if you see that your work/lifestyle situation is flexible, you should run several scenarios.
The more money you have in your nest egg, the more complicated it gets. That’s because you'll need to consider greater tax and estate planning considerations. You should also remember that most retirement withdrawals outside of Roth-type plans are taxable, so what you keep after taxes should be a big part of your planning calculations.
Reference: Forbes (June 1, 2018) “Social Security Benefits: Getting Paid To Wait”