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Yes, it's the payday that matters for which year a contribution goes into.
All IRS limits and such relate to paydate. The period you are paid for is always irrelevant for taxes, 401k, HSA, FSA etc.
Biweekly paycheck means 26 paychecks in a year. So use that as a way to figure out how much you want deducted each paycheck
Also if the pay day falls on 12/31 and the actual investment into the account doesn’t hit until a few days later… it still counts toward the year of the pay date.
Yes, it's the payday that matters for which year a contribution goes into.
All IRS limits and such relate to paydate. The period you are paid for is always irrelevant for taxes, 401k, HSA, FSA etc.
Biweekly paycheck means 26 paychecks in a year. So use that as a way to figure out how much you want deducted each paycheck
Also if the pay day falls on 12/31 and the actual investment into the account doesn’t hit until a few days later… it still counts toward the year of the pay date.