The bottom line on getting your credit scores in better shape

Dear Liz: I want to write a letter of explanation to be included on my credit reports to explain a negative posting. How much impact will the letter have on my credit scores?

Answer: Credit scoring formulas can’t read, so letters of explanation won’t help your scores.

You do have a federal right to demand the credit bureaus include your explanation, which is also known as a consumer statement, in your credit reports. Theoretically, the statement could help a lender understand why you have the negative mark — but only if a human being actually examines your credit report and uses the information in evaluating your creditworthiness.

Because lending is largely automated, however, there’s no guarantee your statement will be read, let alone factored into a lending decision. Many of the other details of your credit report are converted to standardized codes used to calculate credit scores, but not consumer statements.

If the negative information in your reports isn’t accurate, you can dispute it with the credit bureaus. If the information is accurate, you can work to offset the effect on your scores.

Paying your credit accounts on time, all the time, will help rebuild credit. So will using less than 10% of your limits on credit cards.

If you don’t have a credit card, consider getting a secured card — where the credit limit typically is equal to the amount you deposit with the issuing bank. Credit builder loans, available at many credit unions, also can help add positive information to your credit reports.

Don’t close accounts, because that could hurt your scores and won’t get rid of any associated negative information.

People with only a few credit accounts also can help their scores by being added as an authorized user to a responsible person’s credit card. The responsible person doesn’t need to grant access to the actual card. Before taking this step, though, ask the credit card issuer whether authorized user information will be imported to your credit reports because issuers’ policies vary.

Side effects of IRA conversions

Dear Liz: I thought your readers would benefit from additional knowledge about Roth conversions. I started converting our IRAs to Roth IRAs when my wife and I turned 60 years old. Years later, I realized that our premiums for Medicare Part B and D were higher because our income in those years exceeded $174,000.

Answer: Triggering Medicare’s income-related monthly adjustment amount (IRMAA) is just one of the potential side effects of a later-in-life Roth conversion.

That’s not to say these conversions are a bad idea.

People with substantial amounts in traditional retirement accounts might benefit from transferring some of that money to Roth IRAs, particularly if the required minimum withdrawals that start at age 72 would push them into a higher tax bracket. They may have a window after they retire, when their tax bracket dips, to convert money and pay the tax bill at a lower rate.

Roths also don’t have the required minimum distributions that apply to other retirement accounts, so people have more control over their future tax bills.

Converting too much, however, can push people into higher tax brackets. Many financial advisors suggest their clients convert just enough to “fill out� their current bracket.

For example, the 12% bracket for married people filing jointly was $19,401 to $78,950 in 2019. A couple with income in the $50,000 range might convert $28,000 or so, because a larger conversion would push them into the 22% tax bracket.

But there are other considerations, as you discovered.

People with modified adjusted incomes above certain levels pay IRMAA adjustments that can add $57.80 to $347 to their Medicare Part B premiums for doctor visits and $12.20 to $76.40 to their monthly Part D drug coverage premiums. Higher income could reduce or eliminate tax breaks that are subject to income phaseouts, and conversions can subject more of your Social Security benefits to taxation.

At the very least, you should consult a tax pro before any Roth conversions to make sure you understand the ramifications. Ideally, you’d also be talking with a fee-only, fiduciary financial planner to make sure conversions, and your retirement plan in general, make sense.

Liz Weston, Certified Financial Planner, is a personal finance columnist for NerdWallet. Questions may be sent to her at 3940 Laurel Canyon, No. 238, Studio City, CA 91604, or by using the “Contact� form at AskLizWeston.com.