Ruling on paying zakaah in instalments because the cash is not available; does she have to take a loan in order to pay zakaah?
Question

                I put my money in two Islamic bank portfolios.

The first is for construction of real estate in an Islamic Indian city. The project was completed three years ago without receiving any money and I cannot withdraw the money. The second is also in real estate, but every four months I receive a small amount of profits that I spend on my needs. For the past three years I have been saving some of my monthly maintenance (from my husband) and have been paying the zakaah on my wealth which has reached the sum of ten thousand. 
But this year I was not able to save because my husband was building a private villa and because prices rose. Now Ramadan is approaching and I feel very worried because I do not have enough money to pay zakaah, especially since I do not like to pay zakaah from bank profits.

My question is: is it permissible for me to divide the ten thousand (which is the amount of my zakaah) according to my ability or should I take a loan and pay the zakaah in one go, then pay off the debt after that?.
Praise be to Allah.
    Firstly: 

    Putting money in a shared bank portfolio to build real estate 
    and then trade in it or benefit from the dividends comes under the heading 
    of dealing in real estate shares. 

    The basic principle with regard to zakaah on shares is: if 
    the company [or bank] has not paid zakaah on its wealth for any reason, then 
    what the shareholders must do is pay zakaah on their shares. If the 
    shareholder is able to find out from the company accounts how much zakaah is 
    due on his own shares (that is if the company has paid zakaah on its wealth 
    in the manner indicated), then he should pay zakaah on his shares in this 
    manner, because that is the basic principle with regard to paying zakaah on 
    shares. 

    If the shareholder is not able to find out about that: 

    If he bought shares in the company with the aim of 
    benefitting from the annual dividend of the shares, not with the aim of 
    trading in them, then this shareholder does not have to pay zakaah on the 
    shares themselves; rather he must pay zakaah on the dividend, at the rate of 
    one quarter of one tenth after one full hijri year has passed since he took 
    possession of the dividend. He should also pay attention to the conditions 
    of zakaah being obligatory and make sure there are no impediments. 

    If the shareholder bought the shares with the aim of trading 
    in them, he should pay zakaah on them as trade goods. If zakaah becomes due 
    on them when they are still in his possession, he should pay zaakah on the 
    market value. If they have no market value, he should pay zakaah on their 
    value as estimated by experts. He should pay one quarter of one tenth, or 
    2.5%, of that value and of the profit if there is any. 

    End quote from Majallat Majma‘ al-Fiqh al-Islami 
    (1/879) 

    Based on that: 

    If you bought this portfolio with the intention of 
    benefitting from the dividends, but you have not received anything, then you 
    do not have to pay zakaah on it. If you have received a small amount of 
    profit, but you spent it before one full hijri year had passed, then you do 
    not have to pay zakaah on it either. 

    If you bought these shares with the intention of trading in 
    them, then you have to pay zakaah every year on the market value of the 
    shares. There is nothing wrong with you paying the obligatory zakaah from 
    any money you have, from bank profits or otherwise, so long as it is 
    permissible according to sharee‘ah. 

    Secondly: 

    If a person is obliged to pay zakaah but he does not have any 
    cash, it is permissible for him to delay paying zakaah until he has the 
    cash, or to pay in instalments whenever he is able to do so, and he does not 
    have to take out a loan. 

    Al-Mirdaawi (may Allah have mercy on him) said in 
    al-Insaaf (3/186): If you are not able to pay it from the wealth itself 
    because it is not available or for some other reason, it is permissible to 
    delay it until you are able to do so. End quote. 

    Shaykh Ibn Baaz (may Allah have mercy on him) said: If the 
    land and the like, such as the house and car and so on, are intended for 
    trade, then you have to pay zakaah every year based on their value at the 
    end of the zakaah year, and it is not permissible to delay that, except for 
    one who is unable to pay his zakaah because he has no other wealth. In this 
    case he may delay it until he sells it and pays the zakaah for all years, 
    each year according to its value at the end of that zakaah year, whether the 
    value was greater than the price or less. What I mean is: the price for 
    which the land or car or house was bought.  

    End quote from Majma‘ al-Fataawa, 14/161 

    And Allah knows best.