A start date is a promise about someone else’s team and about the job you are leaving. Offer a date you can keep. If they need someone sooner, ask for the real date and answer yes or no. Do not agree and then slip. This page leads with that start-date language.
Notice and overlap
Count your notice period, any prepaid bonus you would owe back, and the days you need between jobs. Say the date, not a vague “a few weeks.” If a signing bonus is what makes an earlier date possible, because you would repay a bonus at the old job, connect those two facts. Do not hide the repayment and then hope they volunteer cash.
You can ask whether the date is flexible by a week. You should not invent a family emergency or a visa timeline. If a real constraint exists, state it simply. The script’s skills box is prefilled with a notice sentence you should rewrite so it matches your contract.
Salary still belongs in the same conversation if it is unresolved. A perfect start date does not repair a target you never said. The anchor section still carries the number.
Questions
Can I negotiate a later start date?
Yes, if you give a date and a real reason, such as a notice period. Offer the date you will hit. A later date is a normal request, not a stunt.