Seems pretty clear to me from the rules below that a loan is in fact against rules. Budget accordingly or suffer the consequences for me I'm afraid.

Healthy budgeting

Try plan a budget from gate receipts and top up with participation bonuses from blog and journals.

All teams will need at least 750k in bank at end of each season to bulk buy CP for following season. At end of season 45 two teams ended with a bank balance lower than 750k, but soon traded CP in when season got underway. This is most unusual but a reminder on the need for healthy budgeting as part of your good management.

The trade window deliberately does not open until after all pre-season info has been submitted so there is no opportunity to trade your way out of poor budgeting.

To clarify a common question: un-used CP or TP will carry over to new season as normal.

No loans are permitted, as this is not in the spirit of the game.