Turnover
Many buyers ask for a yearly turnover of up to twice the yearly contract value. Check whether the rule uses your last year, an average over several years, or turnover in a specific field.
Insurance
Look for the amount, the type (public liability, employer's liability, professional indemnity) and whether you need it at the bid deadline or only at contract start.
Guarantees and bonds
Some contracts ask for a performance bond or a bank guarantee. These cost money and take time to arrange. Find out early.
Currency
Foreign tenders state amounts in their own currency. Convert carefully and note the rate you used.