还 here is read huán (4th tone, 'to return / repay'), NOT hái (still / yet). Common context: home mortgages — 房贷 (fángdài, mortgage), 还房贷 (pay the mortgage), 提前还贷 (early repayment). 月供 (yuègòng, monthly installment) is the standard payment.
mistakes
Don't confuse 还 (huán, repay) with the high-frequency 还 (hái, still). Wrong tone here changes the whole meaning. Tip: when 还 is followed by something owed (债, 钱, 贷, 款), it's huán.
