The law in plain English
Return deadline
Under Iowa Code Section 562A.12, the deposit response usually has to be sent within 30 days of the move-out timeline described by the state rule.
Required notice
Iowa generally caps the deposit at 2 months' rent, and the landlord usually has 30 days after termination and receipt of the forwarding address to send an itemized statement and refund or risk forfeiture and double-damages exposure.
This dispute type
Iowa renters usually push back on carpet-cleaning deductions when the landlord appears to be charging for routine turnover rather than a tenant-caused problem. The timing, itemization, and bad-faith rules still matter even when the landlord says the carpet needed extra work.
Penalty leverage
If the withholding was wrongful or in bad faith, the exposure allowed under the statute is: Landlord forfeits the right to retain; you can recover up to twice the amount wrongfully withheld as damages