There is an art to negotiation which is why I hope you have a very good agent working on your behalf. The sellers have agents and you should too.
Certified Buyer Representative
Senior Real Estate Specialist
Century 21 Princeton Properties
If you are not working with a Realtor, then I would ask you, "why not?".
The amount listed in the approval letter is the same as your offering price. Sorry, this process is simply not that complicated.
You can also have the lender's pre-approval letter for the exact amount of your offer. If the seller counters and you meet in the middle you may need to send a new letter each time you counter.
The Corcoran Group