If an employer wants to offer employees pretax payroll deferrals to their health savings accounts, the employer needs to first create a Section 125 plan or cafeteria plan that allows HSA deferrals.

The flexibility of HSAs makes them appealing for a wide range of users, but that same flexibility can make explaining these accounts a challenge. No two people have identical health benefit needs, and each employee will use an HSA differently.

A growing number of Americans are incorporating strategies for affording health insurance into financial planning, adapting money and salaries to yield better choices much as people place money into 401(k) plans to save for retirement while reducing their taxes.

Here are 7 key changes the Senate and House tax plans make to 401(k), 403(b), and 457(b) retirement plans.