You would add the 600 listed on the 1099-S for the reimbursement of tax payment as an increase to the basis (add it to the total you enter as the "Adjusted Basis".
IRS Pub 530 states for the Buyer to lower the basis for taxes paid by the Seller, so it only goes to prove the opposite would also be true, Seller would increase the basis for tax paid and reported on the 1099-S.
In other words, since the 1099-S includes 600 for the tax, the 600 is part of the basis.
“If the seller actually paid for any item for which you are liable and for which you can take a deduction (such as your share of the real estate taxes for the year of sale), you must reduce your basis by that amount unless you are charged for it in the settlement.”
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