Originally Posted by jib71

If you miss the last bus, your choices are a cab or a rental car or staying overnight at Narita. Car rental can be cheaper than cab - but some hassle to return. [Not sure where the closest 24 hour rental station is to Tokyo station - I've used one near Iidabashi for this kind of trip]. I would only suggest it if you're already familiar with Japanese sat-nav and feel confident about using it to drive into town. Cabs have published fixed rates for trips into the city, but I think those rates are probably bumped up for midnight trips.