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senior debt vs whole loanSenior Debt vs Whole Loan: How the Two Structures Differ
By James Dawes, CeMAP, Founder, James William & Co Capital
Senior debt and a whole loan are not opposites, because a whole loan can behave like senior debt. Senior debt describes a lender’s ranking: it is repaid first and holds first claim on the security. A whole loan describes how the money is packaged: one loan from one lender, covering more of the cost than a conventional senior facility. If you are funding a UK acquisition or development, the practical question is how much of the capital stack one lender will cover, at what price, and with what paperwork. We structure that for developers, investors and high-net-worth clients through our development finance work, and this guide sets out how to think about it.
TL;DR
- Senior debt is a priority label: first claim on repayment and on the secured assets if things go wrong.
- A whole loan is a single facility that can run to a higher loan to value (LTV) than traditional senior debt, often sitting where senior and mezzanine would otherwise be split.
- Reported figures from 2023 put whole loans at up to around 70% LTV and margins of roughly 350 to 450 basis points, against about 50% LTV and 125 to 250 basis points for senior loans.
- A whole loan can be tranched internally into senior and junior parts, so read the intercreditor and loan documents before you compare headline rates.
- The right choice depends on your target leverage, your speed requirement and how many lenders you want to manage.
Table of Contents
- What senior debt actually means
- What a whole loan is
- Can a whole loan also be senior debt?
- How the numbers compare
- Why borrowers choose a whole loan
- Why borrowers still use separate senior debt
- What to check in the documents
- A worked example
- When each structure tends to fit
- The Perspective from James William & Co
- Talk to us about structuring your next deal
- FAQ
- Sources
What senior debt actually means
Senior debt is defined by priority. HMRC’s Corporate Finance Manual describes it as debt that gives the holder the first claim to repayment and recourse to secured assets on insolvency, while subordinated or junior debt ranks lower and is paid only after senior claims are met in full.
That ranking drives price. The general logic of a capital structure is that senior debt sits at the top and is repaid first, which makes it lower risk, while equity ranks last and carries the highest risk. Lower risk for the lender means a lower margin for you. The trade-off is that senior lenders usually fund a smaller slice of the value, so you plug the gap with something more expensive.
In UK property, senior debt typically means a first legal charge over the asset, whether that is a bridging loan, a development facility or a commercial mortgage. If you want to see how lender types map to each product, our guide to types of property finance for UK developers walks through them.
What a whole loan is
A whole loan is a single loan facility that covers the whole of a borrower’s leverage requirement, rather than being assembled from separate senior and junior lenders. Savills Investment Management, as reported by KED Global, says whole loans typically function like a senior mortgage, being first in line for any capital on sale of the underlying asset. So in ranking terms, a whole loan can be senior debt. The difference is how much it lends and how it is built.
There is a second, more technical meaning. In European commercial real estate documentation, a whole loan can also describe a loan documented in one facility agreement that is then tranched into an A loan and a B loan, with the tranching generally not disclosed to the borrower. In the same scenario, the same loan goes to the same borrower or borrowers and is secured by the same security package, with contractual subordination between the junior and senior tranche.
For you as a borrower, that means one set of loan documents, one relationship and one set of terms, even if the lender has split the risk behind the scenes.
Can a whole loan also be senior debt?
Yes. Think of two questions that are easy to confuse:
- Where does the lender rank against others? This is the senior or junior question.
- How many lenders and facilities make up the funding? This is the whole loan or split structure question.
A whole loan from a single lender that holds a first charge and is repaid first on sale is senior in ranking. If that same lender then sells a junior participation to another investor through an A/B arrangement, the borrower still sees one loan, while behind it there is a senior tranche and a junior tranche. The CREFC Europe paper uses the term senior for a lender group that is not subordinated in order of payment to another lender group, and junior for one that is, including mezzanine and B lenders.
So the honest comparison is rarely “senior versus whole loan”. It is usually one of these:
- A conventional senior loan, plus separate mezzanine or equity to fill the gap.
- A single whole loan that covers most or all of that gap in one facility.
How the numbers compare
KED Global’s reporting of Savills Investment Management’s view in October 2023 gives the clearest published comparison for the UK market.
| Feature | Senior loan (as reported) | Whole loan (as reported) |
|---|---|---|
| Typical LTV | Around 50% | Up to around 70% |
| Margin | 125 to 250 basis points | 350 to 450 basis points |
| Ranking | First in line on sale | Typically functions like a senior mortgage |
| Number of lenders | Often one of several in the stack | Can be sourced from a single lender |
Two cautions on reading this table. First, these are indicative figures from a 2023 report, and lending terms move with the base rate, swap rates and lender appetite, so treat them as a guide to the relationship between the two structures rather than a quote. Second, LTV ceilings depend on the asset, sponsor and exit. A 2018 interview with a Savills Investment Management executive put senior debt at about 60 to 65% LTV, with whole loans reaching the 75 to 85% seen in mezzanine loans, which shows how much the ranges shift over a cycle.
Blended cost is what matters
A higher margin on a whole loan does not automatically mean it costs more than the alternative. Compare the blended cost of the whole stack. If a senior loan at 50% LTV is paired with mezzanine for another 20%, you pay the senior margin on the first slice and the mezzanine margin on the second, plus separate arrangement fees, legal costs and valuation work for each lender. A whole loan prices the lot at one margin and one fee schedule.
The same discipline applies to returns. Developers compare return measures such as yield on cost against market yield to see whether a project still clears its hurdle after funding costs, and the debt structure feeds straight into that sum. Run the model on the blended rate, not on the senior rate alone.
Why borrowers choose a whole loan
Three reasons come up repeatedly.
More leverage from one source. Where a senior loan caps at a lower LTV, a whole loan can close more of the gap. That means less equity in the deal, or less reliance on a separate junior layer.
One party to deal with. Savills Investment Management notes that whole loans are sourced from a single lender, which makes them easier to manage and negotiate over time since there is only one party to deal with. When a scheme needs a variation, an extension or a waiver, one conversation is quicker than coordinating a senior lender and a mezzanine funder whose interests may differ.
Speed to put in place. Where an A/B arrangement sits behind the loan, the JDSupra commentary on modern intercreditor agreements says it does not require the pricing and tranching to be set at origination or a more cumbersome borrower group structure, and may well be quicker to put in place. For a time-pressured acquisition, that matters.
Why borrowers still use separate senior debt
A split structure remains the right answer for many deals.
- Lowest cost on the core slice. If your equity is ready and you only need conservative leverage, senior debt at a lower margin is the efficient answer.
- Choosing each layer separately. Pairing a senior lender with mezzanine finance or joint venture equity lets you tailor each piece, for example a longer senior term with a shorter, more expensive top-up.
- Flexibility on the junior layer. You can repay or refinance the mezzanine early and keep the senior loan in place.
- Lender appetite. Some assets, such as ground-up schemes with phased drawdowns, fit particular senior lenders very well.
Our article on how to structure a development finance deal when margins are tight covers the stacked approach, and the shifting development finance landscape looks at how stacks are changing.
What to check in the documents
The headline LTV and margin tell you only half the story. The intercreditor agreement and loan agreement decide who gets paid, in what order and who controls decisions in a default.
The payment waterfall
The intercreditor agreement sets out lender rights to cashflow, payment waterfalls and subordination. According to the JDSupra commentary, in a whole-loan structure the loan agreement ranks property-running and borrower operating costs ahead of distributions to the loan finance parties, while senior and mezzanine structures may use separate waterfalls in each loan agreement. Ask which one applies to your deal and what it means for cash trapped at the borrower level.
Who sees the tranching
In a whole-loan structure, tranching and pricing may not be transparent to the borrower. A disclosed A/B loan, by contrast, makes the borrower a party to the arrangement among lenders on subordination, voting rights and pricing. If you expect to ask for waivers or amendments, know whether you will be negotiating with one lender or a group, and who holds the decision rights.
Security and covenants
Check the security package, the financial covenants and the events of default. Cross-security across assets can change how a lender behaves in a workout, so our guide to cross-collateralisation loans in England is worth reading if your deal spans several properties.
Repayment profile and exit
A bullet structure repays the capital at the end, while amortising loans reduce it over the term. Your exit route, whether sale or refinance, should shape that choice, which is the argument in our piece on bullet versus amortising loans in UK property finance.
A worked example
Take a hypothetical UK acquisition at a £10m purchase price and ignore fees to keep it simple. This is an illustration only and not a quote.
- Split structure: a senior loan at 50% LTV funds £5m. A further £2m of mezzanine takes the stack to 70%. You contribute £3m equity.
- Whole loan: one lender provides £7m at 70% LTV. You contribute the same £3m equity.
The equity cheque is identical, so the decision turns on the blended margin, the fee stack, the number of lawyers and lenders involved and how fast each can complete. If the single lender’s whole loan margin is below the blended margin of the two-layer stack, the whole loan wins. If a competitive senior lender is cheap enough on the first £5m to pull the blended rate below the whole loan margin, the split wins. Only a priced comparison tells you which, and the answer changes by asset, sponsor and month.
When each structure tends to fit
| Your situation | Structure worth testing first |
|---|---|
| You want maximum leverage and one counterparty | Whole loan |
| You have ample equity and want the lowest margin | Senior debt only |
| You need a tailored junior layer with its own repayment terms | Senior plus mezzanine |
| You want to share equity risk and upside | Senior plus joint venture equity |
| The deal is time critical | Whichever structure has a lender ready to commit |
For a wider view of where funding comes from, see our guide to real estate funding sources for UK developers and our overview of real estate debt in UK property.
The Perspective from James William & Co
Borrowers often arrive asking whether they should take senior debt or a whole loan, as if one had to be chosen over the other. In our experience of structuring deals, the better question is what blended cost, leverage and certainty of execution the whole stack gives you.
We work with specialist lenders, family offices and private credit funds beyond the mainstream banks, so we can price a conventional senior facility, a senior and mezzanine stack and a single-lender structure side by side. Our approach is to take your numbers, your exit and your timetable, and then build the structure that fits, rather than start from a product.
What does this mean for you? One point of contact who negotiates the terms, reads the intercreditor and loan documents with you and keeps your plans moving through to completion.
James William Dawes
Talk to us about structuring your next deal
We arrange development finance, including mezzanine finance and joint venture equity, alongside bridging finance and commercial mortgages for UK developers, investors and high-net-worth clients. Our capital concierge approach gives you a single point of contact for structuring, negotiation and execution, whether your deal needs senior debt, a larger single facility or a layered stack.
Tell us the asset, the leverage you are aiming for and your timeline, and we will come back with structures to compare. Start at jwcapital.co.uk.
FAQ
Is a whole loan the same as senior debt?
Not exactly. Senior debt is a ranking: first claim on repayment and security. A whole loan is a packaging choice, a single facility that typically functions like a senior mortgage and is first in line on sale, but which may stretch to a higher LTV. It can also be tranched into senior and junior parts behind the scenes.
Is a whole loan more expensive than senior debt?
On the margin alone, usually yes. Savills Investment Management’s figures, reported in 2023, put whole loans at about 350 to 450 basis points against 125 to 250 for senior loans. The fairer test is the blended cost of the full stack, because a senior loan often needs mezzanine or equity alongside it.
What is the difference between a whole loan and an A/B loan?
A whole loan is documented as one facility, and the lender may tranche it into an A loan and a B loan without telling the borrower. In a disclosed A/B loan, the borrower is party to the agreement between lenders on subordination, voting rights and pricing. The practical effect is who you negotiate with when you need a change.
Which structure suits a UK property developer?
It depends on equity, target leverage and speed. A developer with strong equity may choose senior debt for its lower margin, while one seeking higher leverage and one counterparty may favour a whole loan. Comparing priced options for your scheme is the only reliable way to decide.
Sources
- HMRC Corporate Finance Manual, CFM11030
- Natixis Investment Managers, private debt
- KED Global, whole loans offer funding solution for stretched borrowers (2023)
- KED Global, whole loan fund interview (2018)
- KED Global, whole loans for borrowers (2023)
- CREFC Europe intercreditor paper
- The Modern Intercreditor Agreement: Legal Terms and Issues
- Yield on Cost: Why Developers Compare 9.23% With 7.5%
Recommended
- SPV vs Trading Company Mortgages: Which Structure Lenders Prefer
- Bullet vs Amortising Loans in UK Property Finance: Plan the Exit First
- Conversion Finance vs New Build: Which Funding Fits?
- First Charge vs Second Charge Bridging: How to Choose
You must keep up your repayments to avoid repossession. We are not a lender. James William & Co Capital Ltd is an Appointed Representative of Flexi Network Ltd, FRN: 1060247. Flexi Network Ltd is authorised and regulated by the Financial Conduct Authority, FRN: 948658. Flexi Network Ltd is an authorised credit broker and not a lender. You can verify both on the Financial Services Register at register.fca.org.uk.
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