Registering your marriage is that you will be able to get a passport, a visa and a number of other documents such as driving license, bank accounts etc. Registering your marriage would be that you can also file your Income Tax Returns. You can easily fill up forms online. You can also open a Bank Account after registering your marriage. Banks offer many options for opening bank accounts. You can also avail all the government benefits such as free electricity, gas, water and so on. Just make sure that you keep proof of your marriage.