納金 is read as のうきん (noukin) and means payment.
のうきん
noukin
のうふきん
contribution
じょうのうきん
money paid to the government
ゆいのうきん
betrothal money
かのうきん
deposit
ほうのうきん
votive offering of money
りょうきんこうのうゆうびん
postage deferred payment mail
きんのう
cash payment
りょうきんべつのうゆうびん
postpaid mail
ぜいきんたいのう
tax arrears
なっとく
consent
のうにゅう
payment (of taxes, fees, etc.)
のうぜい
payment of taxes