In short, you should see in which position you are benefitted more.
For the moment forgot about profit and loss and compute your income as per S.44AD which is 8% of the gross receipts. Note this 8% is your deemed income and tax would be computed thereon.
Estimate the tax on TOTAL INCOME.
After this consider cost of audit fees and maintenance of proper books and add these costs [since audit fees is deductible expense] Now recompute the loss.
Estimate the tax ON TOTAL INCOME
[You should consider the TAX EFFECT of transaction, eg if loss is 40,000 and your tax bracket is 10% the tax effect is only 4000, which would be LESS than the audit fees alone and hence it would be beneficial to pay tax than to get the accounts audited.]
See under which position you are benefited, whether by declaring loss or by accepting income.
One more point which you should consider is your willingness to continue such transactions in further years. But most important thing is to establish the equilibirium, the break even point for tax audit. One might take over 5k for this
See if the benefit of carry forward of loss worth it?