Once Pakistan's election winner ImranKhan forms a government, there will be little time to bask in his triumph, the country's next prime minister will inherit a critical economic situation, and analysts say he must act fast.

The new leadership may be forced to seek a bailout from the International Monetary Fund (IMF) in the coming weeks.

Here are some questions and answers about Pakistan's predicament:

What is the problem? 

Pakistan is on the verge of a balance-of-payments crisis, which threatens the stability of its currency and its ability to repay debts or pay for imports.

Its budget deficit has grown steadily over the past five years, from four percent to 10 percent of GDP.

Imports have skyrocketed, mainly due to rising oil prices. Between July 2017 and March, about 70 percent of the country's import bill was for energy, machinery and metals, according to a State Bank of Pakistan report.

Meanwhile, exports -- mainly textiles -- have increased only slightly.

As a result, the country's foreign currency reserves have declined to about $10.3 billion, according to recent figures given by the caretaker government.

This covers less than two months of imports, analysts say. Meanwhile the rupee has been devalued four times since December, fuelling inflation.

"We borrowed like crazy in the last four to five years, so it's time to repay. But we don't have... reserves," former finance minister Hafeez Pasha told AFP.

How much does Pakistan need? 

Pakistan has gone to the IMF repeatedly since the late 1980s. The last time was in 2013, when Islamabad got a $6.6-billion loan to tackle a similar crisis.

Today, the country "needs at least $12 billion", says Zeeshan Afzal, the director of Insight Securities, a Karachi-based consulting firm.

If approved, it would be Pakistan's largest-ever bailout.

But it has not yet completed repayments on its previous loan, which could limit its current leeway with the Fund.

"Islamabad is betting on a maximum of $6.5 billion, hoping that this will have a virtuous effect on the confidence of the markets," a senior diplomat, who asked to remain anonymous, told AFP.

What is the impact on Khan? 

Khan promised to create an "Islamic welfare state" on the campaign trail, but the plan -- which would require big public spending on health and education -- could be stillborn if the economy tanks.

"We will have weeks, not months" to act, Asad Umar, widely tipped to be the next finance minister, told the Financial Times on Thursday.

All options are on the table, he has tweeted, telling media that the new government is considering privatising all state-owned companies, including the once-illustrious, now debt-laden Pakistan International Airlines.

But there are fears in Pakistan that the terms of any new IMF bailout will be stricter than in 2013, thanks to the tense relationship between Islamabad and Washington, one of the Fund's biggest donors.

The US has warned that it will be watching closely to ensure Pakistan does not use IMF money to repay debts to China, which has poured billions into Pakistan for infrastructure projects under its Belt and Road Initiative.

Is there any other option?

Pakistani media have reported a recent $2 billion loan from China and another $4.5 billion from Saudi Arabia, though the transactions have not been confirmed. In any case, Saudi funds would only be used to buy oil.

In the face of a trade imbalance, Khan could try to reduce imports. But such measures have never borne fruit in a country with porous borders and numerous smuggling networks, especially for consumer goods -- a major import item.

He could also seek to improve foreign investment. Khan has said his anti-graft campaign and clean government will improve the country's image abroad, hopefully attracting investors who have been spooked by instability and structural issues in recent years.

The World Bank ranked Pakistan 147th out of 190 countries last year for its business climate.

Khan has vowed change on the home front too, saying his government will dramatically boost tax revenues. That is a major, perennial challenge: only a tiny percentage of those liable actually pay taxes in Pakistan.

A further massive devaluation of the rupee, which would deter imports and make exports cheaper and more competitive, could be considered.

But then "people would be in the streets," predicts Pasha, the former finance minister.

"It would be the end of Imran Khan."