Dear Liz: I wanted to alert you to the fact that online tax preparation companies are up to their old tricks again this year despite being called out last year for deceptively hiding their free tax filing from eligible filers. My son, who qualifies for free filing, was redirected to the paid “deluxe” version when it turned out he qualifies for a “Savers Tax Credit.” He makes modest tax-deferred contributions through an employer that matched contributions. (He’s a low-income student who works in retail.) He logged out of that website and instead successfully used a competitor provider for free.

Answer: The way to access the IRS’ Free File program is through the IRS website, which directs people to the private tax preparation companies that have agreed to offer this service. Unfortunately, many of those same companies spend a lot of money trying to obscure that fact that most Americans can file for free.

Independent news organization ProPublica reported last year that tax preparation companies were hiding their free file options from online search engines and steering people instead into paid tax preparation. A government report in February confirmed that more than 14 million taxpayers paid for tax preparation last year that they could have received free.

The companies have since been banned from hiding the free option and are supposed to include a link that returns people to the IRS Free File site if they don’t qualify for the company’s free offer. But ProPublica found that they continue to steer people away from free filing in various ways, including advertising that misuses the word “free.”

Also, many people like your son discover only late in the tax preparation process — often after they’ve added most of their information — that they don’t qualify for that company’s free option, although they would qualify elsewhere.

Here’s what people need to know about free filing:

People with adjusted gross incomes under $69,000 a year can qualify for free filing, but they should start their search at the IRS Free File webpage.

People in the military and their families can use MilTax, provided by the Department of Defense.

They can also get advice from a tax professional at (800) 342-9647.

In addition, people may qualify for the IRS’ Volunteer Income Tax Assistance if they make less than $56,000, live with a disability or speak limited English. Use the Volunteer Income Tax Assistance locator tool or call (800) 906-9887.

People who don’t qualify for the above services can still use free fillable forms. In addition, some tax preparation companies may have free options for people filing basic forms. The types of income and credits that allow someone to file for free should be prominently displayed on the company’s free file page.