What will happen if my passport expired two months ago and I have not?
Nothing significant will happen if you let your passport expire and dont renew it. You can renew is anytime after expiry whenever you want. Only cons are that you cant use expired passport for anything like identity/address proof or to travel. And if you are renewing after long time (I guess 1 Yr) of expiry then might have to go through police verification again. So, there is no requirement by law for renewal of passport. Its your wish if you want to renew it now or later or never.