Any startup will tell you that cash flow is absolutely crucial to the survival of their business. Two-thirds of startups have less than a year's worth of money left, according to Anand Sawal of investment analysts CB Insights.

Some startups are lucky enough to be profitable from year one, either thanks to income from clients or channelling their own funds into the business. However many have to seek external funding.

Throwing money
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There are a vast range of options facing founders today. You can go to an angel investor, a venture capitalist, bootstrap the business with your own money, crowdfund, ask for a bank loan, enter an accelerator or incubator programme, partner with a bigger firm, or even run a new-fangled blockchain 'token exchange campaign'.

Unfortunately "this is the decision most founders get wrong, often hindering or causing irreparable damage to the startup’s longer term prospects", warns Ofri Ben Porat, cofounder of Pixoneye.

As a rule, your best bet when building a funding strategy is to "focus on the type and scale of the problem your product is aiming to solve, and then consider how and when specific investors can help you achieve those goals", advises Damian Kimmelman, cofounder of DueDil.

We've spoken to a range of founders and investors on the pros and cons of these various routes. Here is what they had to say.

The pros and cons of: bootstrapping

Bootstrapping means funding a company using personal finances or its operating revenues. Some founders swear by it, like Colette Ballou, who set up Ballou PR. She tells Techworld: "Bootstrap if you can. I always have."

What are the advantages of this route? Put simply, it keeps you in full control of your company and spending.

"The main benefit of starting and growing the business from personal investment is that we don’t have to justify any spend to a board or worry about outstanding debts," says Jake Madders, cofounder of Hyve Managed Hosting.

However there are downsides. The main issue is that there are big restrictions on growth. Basically, a 'bootstrapped' startup can't grow more quickly than their credit permits, whereas external funding lets you to grow as quickly as you need or want to.

It also means that, as money for hiring is tight, founders have to take on the vast majority of the legwork.

"It has meant a lot of long hours. It has required a lot of work on the part of Jon and I [the cofounder]," Madders admits. But even this he says, has allowed him to have "such a personal pride in seeing the success of the company, having been involved in every step of the journey".

The pros and cons of: angel investors

There is a lot to be said for choosing to go to an angel investor, especially an individual within your specific sector that you have a good existing relationship with. It is a popular route for early-stage startups that need a bit of extra money to help get them off the ground.

"One of the best ideas is to get angel investors who are a few stages ahead of you in their business journey. Angels who have already made massive successes might be too removed from the problem you are trying to solve," Kimmelman says.

Angel investors will choose to invest in your startup because they share your vision and excitement, and have faith in your team and the viability of your idea, Porat says. They will be committed, basically, and they will be able to be a supportive, realistic mentor of your business.

Where are the disadvantages? You will have to cede some control over your business, at least slightly. The angel investor will expect a cash return or equity in the business (they aren't charities).

Angel investment may also be less appropriate if you are a later-stage startup or need access to large sums.

The pros and cons of: venture capital investors

Venture capitalists get a lot of attention in the tech press yet they are inappropriate for the vast majority of startups. So it's really important to think through whether it's the right route for you before you plough time and effort into trying to get VC funding.

One of the biggest advantages of VCs is they have access to vast sums of money, so it's a good option if you need to expand at a rate beyond that available via angel investors or bank loans. They also have great connections and experience, so will be able to help make introductions and give advice, as well as support on tax, law and personnel.

However, tread very carefully. You will have to cede even more control over your business than with angel investors. VCs will take a sizeable stake in your business and will expect a say over its future direction. It also sets a clock ticking to the sale of your company, when VCs expect to 'exit' with a sizeable return.

"Don’t rush towards VC funding. If you’re in the early stages particularly," Porat warns.

It is absolutely crucial to bear in mind that "angels manage their own money, while VCs manage other people’s funds," he says.

The pros and cons of: corporate partnerships 

Many startups are naturally wary of partnering with a big corporate. They are very different beasts culturally, financially and in many other ways, so caution is warranted.

However, it isn't a route to jettison automatically. 

"As long as the founders retain control over the daily business operations and enough freedom, the ‘corp-up’ approach provides a number of benefits that a VC could never replicate," says Boris Bogaert, cofounder of Xpenditure.

In particular, these benefits include access to the resources, customers and products of a multinational company and a trusted 'brand' from day one, he says.

Corporate venture capital, where startups take money from a big corporate's fund, is also an option. For example fintech startups have received investment from CVCs like Santander 'InnoVentures', Citigroup's 'Citi Ventures' and Goldman Sachs, says Ali Ramadan, VC specialist at law firm Bird & Bird.

These corporates can help with expertise, navigating regulations, plus supplier and customer networks, he adds.

However, there are massive risks, as referred to earlier. Partnering with a corporate can be playing with fire, and startups should be aware of their relative size and strength.

The same issues around loss of control crop up, but to compound that there is also the fear that a corporate could steal your intellectual property, try and buy your startup (though this could be desirable!), overload you with bureaucracy or force you to lose flexibility or identity, for example adopting their branding.

You also need to have a lot of trust in that corporate. If you're putting all your eggs in one basket, you'd better ensure it's a reliable one.

The pros and cons of: crowdfunding

Although not always the first route startups consider, there are plenty of upsides to running a crowdfunding campaign. It's a popular route for B2C startups in particular.

"Crowdfunding platforms can offer young businesses the opportunity to not only raise funds but also test the concepts of their new idea directly with interested consumers, helping them develop their products in the meantime," Ramadan says.

The advantage of crowdfunding is it combines raising money with a marketing campaign, says Joel Hughes, UK head of technology and hardware at Indiegogo. This worked well for Monzo bank for example, which raised £2.5 million in under 24 hours. 

"Now the regulations have been put in place to allow equity crowdfunding, anyone can invest in the companies they believe in. This helps the business get help from a broader pool of investors and, in exchange, these investors benefit financially if the company is successful, and more than ever can feel like part of the team," he adds.

However there is one obvious, big risk: you (very publicly) fail to raise enough money. This can lead to both financial and reputation damage, and can mean you walk away empty handed.

There is also the fear that others may copy your idea, and it can be a very time-consuming way to raise cash.

The pros and cons of: a token exchange campaign 

Here's a new one on us: a token exchange campaign (TEC), also referred to as 'initial coin offerings'. Some VCs have suggested this could be the future of investment, such as Jamie Burke, CEO of Outlier Ventures & Convergence VC.

One company called Blockpool is running a 'TEC' campaign right now. They are making 25 million 'coins' available in exchange for either cryptocurrency or currency, with all the transactions stored on a distributed ledger, ensuring a fair and equal percentage split across all contributions.

The benefits, according to Blockpool's cofounder David Blundell, are that TECs are open to all investors, allow startups to dictate their own terms, have lower fees than the alternatives, lead to more community interaction and keep control with the startup founders to crowdfund as they choose. It also lets them accept any currencies, thus widening the potential pool of investors.  

However there are downsides. Although some VCs are hailing them as the future, some investors can be wary about putting their money into TECs as there are still questions over how they are regulated. They also have no say over how the money they provide gets spent, as they don't get a stake in the business.