It is common to ask for one month's rent as a security deposit but you typically have the freedom to make it higher or lower, as you wish.
yes
A half-down non-refundable deposit would be a 50% deposit on what you're making the deposit on (a $700 per month rent apartment might require a half-down deposit, i.e. $350), this deposit will not be returned at the end of the term / deal / transaction.
It sounds like the landlord wants to change the terms of the tenancy. They can do that, but they would have to follow the proper procedure. If this is a year lease, they have to wait until the year is up. If a month-to-month tenancy, they have to give a full month's notice. Also, some states limit the amount of a security deposit to one month. A pet deposit is a security deposit, regardless of what someone calls it. If they have collected a one-month security deposit already, state law may prohibit collecting another deposit.
Some landlords require all three, some don't. It's up to the parties to agree on the terms, but the landlord set his terms, and the tenant can take the place or leave it.
Yes you can get a mortgage if you earn £2000 a Month, but they may ask you to put a deposit down, click the link below for more info about a mortgage/deposit.http://www.creditchoices.co.uk/how-big-a-deposit-do-i-need-to-get-a-mortgage.html
interest
In most states you cannot charge a security deposit higher than the amount of one month's rent. But I don't know specifically about Texas.
As a general rule all apartments require at least $250 as a cleaning deposit, most apartments today are asking for one month's rent as deposit for cleaning, but for cheaper you can get this lesser amount.
NO!
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Normally not: a security deposit cannot be used as last month's rent, nor vice versa, without mutual agreement.
Yes he can. Deposit usually cannot be higher than a month's rent. Last month's rent may not be used as a deposit.