diff --git a/config_full.json.example b/config_full.json.example
index b9631f63d..4e692d371 100644
--- a/config_full.json.example
+++ b/config_full.json.example
@@ -2,6 +2,7 @@
     "max_open_trades": 3,
     "stake_currency": "BTC",
     "stake_amount": 0.05,
+    "tradable_balance_ratio": 0.99,
     "fiat_display_currency": "USD",
     "amount_reserve_percent" : 0.05,
     "dry_run": false,
diff --git a/docs/configuration.md b/docs/configuration.md
index 90f0aa791..1acd6162c 100644
--- a/docs/configuration.md
+++ b/docs/configuration.md
@@ -43,6 +43,7 @@ Mandatory parameters are marked as **Required**, which means that they are requi
 | `max_open_trades` | **Required.** Number of trades open your bot will have. If -1 then it is ignored (i.e. potentially unlimited open trades).<br> ***Datatype:*** *Positive integer or -1.*
 | `stake_currency` | **Required.** Crypto-currency used for trading. [Strategy Override](#parameters-in-the-strategy). <br> ***Datatype:*** *String*
 | `stake_amount` | **Required.** Amount of crypto-currency your bot will use for each trade. Set it to `"unlimited"` to allow the bot to use all available balance. [More information below](#understand-stake_amount). [Strategy Override](#parameters-in-the-strategy). <br> ***Datatype:*** *Positive float or `"unlimited"`.*
+| `tradable_balance_ratio` | Ratio of the total account balance the bot is allowed to trade. Only applies when `stake_amount="unlimited"`. [More information below](#understand-stake_amount). <br>*Defaults to `0.99` 99%).*<br> ***Datatype:*** *Positive float between `0.0` and `1.0`.*
 | `amount_reserve_percent` | Reserve some amount in min pair stake amount. The bot will reserve `amount_reserve_percent` + stoploss value when calculating min pair stake amount in order to avoid possible trade refusals. <br>*Defaults to `0.05` (5%).* <br> ***Datatype:*** *Positive Float as ratio.*
 | `ticker_interval` | The ticker interval to use (e.g `1m`, `5m`, `15m`, `30m`, `1h` ...). [Strategy Override](#parameters-in-the-strategy). <br> ***Datatype:*** *String*
 | `fiat_display_currency` | Fiat currency used to show your profits. [More information below](#what-values-can-be-used-for-fiat_display_currency). <br> ***Datatype:*** *String*
@@ -144,6 +145,12 @@ To allow the bot to trade all the available `stake_currency` in your account set
 "stake_amount" : "unlimited",
 ```
 
+When using `stake_amount="unlimited"`, we recommend to also set `tradable_balance_ratio=0.99` (99%) - to keep a minimum balance for eventual fees.
+This will keep 1% of your account balance "untradable" in your account.
+
+!!! Note:
+    This configuration will allow increasing / decreasing stakes depending on the performance of the bot (lower stake if bot is loosing, higher stakes if the bot has a winning record, since higher balances are available).
+
 In this case a trade amount is calculated as:
 
 ```python
diff --git a/freqtrade/constants.py b/freqtrade/constants.py
index d7c6249d5..d5ba00cd5 100644
--- a/freqtrade/constants.py
+++ b/freqtrade/constants.py
@@ -73,6 +73,12 @@ CONF_SCHEMA = {
             'minimum': 0.0001,
             'pattern': UNLIMITED_STAKE_AMOUNT
         },
+        'tradable_balance_ratio': {
+            'type': ['number'],
+            'minimum': 0.1,
+            'maximum': 1,
+            'default': 0.99
+        },
         'fiat_display_currency': {'type': 'string', 'enum': SUPPORTED_FIAT},
         'dry_run': {'type': 'boolean'},
         'dry_run_wallet': {'type': 'number', 'default': DRY_RUN_WALLET},