2 Corrected egregious spelling/style errors (sorry) and expanded slightly on some points
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Some very good answers here already. I will just add to those that say you should not be driven to meet his deadlines to your own detriment and say that. Also, I would definitely have a word with the sales person and remind him that if he over-promises and the company cannot deliver on his promises then he (and the company) will not be trusted in the future, losing him future commissions (and possibly his job), so it is in his best interest to be realistic (consultingi.e. consult with programming staff) so that he gains trust in the company. In the short term he may gain by being unrealistic, but in the long term he will lostlose out by damaging his reputation with customers, his employer and future employers via bad references.

As sales people understand money more than anything else, talk to him in those terms.

Some very good answers here already. I will just add to those that say you should not be driven to meet his deadlines to your own detriment and say that I would definitely have a word with the sales person and remind him that if he over-promises and the company cannot deliver on his promises then he (and the company) will not be trusted in the future losing him future commissions (and possibly his job) so it is in his best interest to be realistic (consulting with programming staff). In the short term he may gain, but in the long term he will lost out.

As sales people understand money more than anything else, talk to him in those terms.

Some very good answers here already. I will just add that you should not be driven to meet his deadlines to your own detriment. Also, I would definitely have a word with the sales person and remind him that if he over-promises and the company cannot deliver on his promises then he (and the company) will not be trusted in the future, losing him future commissions (and possibly his job), so it is in his best interest to be realistic (i.e. consult with programming staff) so that he gains trust in the company. In the short term he may gain by being unrealistic, but in the long term he will lose out by damaging his reputation with customers, his employer and future employers via bad references.

As sales people understand money more than anything else, talk to him in those terms.

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Some very good answers here already. I will just add to those that say you should not be driven to meet his deadlines to your own detriment and say that I would definitely have a word with the sales person and remind him that if he over-promises and the company cannot deliver on his promises then he (and the company) will not be trusted in the future losing him future commissions (and possibly his job) so it is in his best interest to be realistic (consulting with programming staff). In the short term he may gain, but in the long term he will lost out.

As sales people understand money more than anything else, talk to him in those terms.