I worked at minor start-up once. They actually had not very much money* and I needed work badly. The contract was explicit that I was being paid a percentage of my hourly rate with a hard promise to pay the rest in monthly installments the second year. The advantage of this is once the 'teaser rate' expires you aren't 'negotiating a raise' to get you back to market rates.

* As opposed to no money, aka the types of companies where the real profit is in the difference between what they pay their employees and the market rate.